Номер 4.1, страница 21 - гдз по физике 9 класс задачник Артеменков, Ломаченков
Авторы: Артеменков Д. А., Ломаченков И. А., Панебратцев Ю. А.
Тип: Задачник
Серия: сферы
Издательство: Просвещение
Год издания: 2011 - 2026
Цвет обложки: синий
ISBN: 978-5-09-038216-8
Популярные ГДЗ в 9 классе
IV. Электромагнитные колебания - номер 4.1, страница 21.
App\Models\Task {#1030 // resources/views/models/task/default.blade.php #connection: "mysql" #table: "tasks" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 1424184 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "21" "field_page_end" => null "field_url" => "/9-klass/fizika/artemenkov-zadachnik/4-1" "field_display_title" => "4.1" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1037 #items: array:1 [ 0 => App\Models\Term {#1036 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 26 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "номер" "field_cases" => array:6 [ "field_accusative_case" => "номер" "field_creative_case" => "номером" "field_dative_case" => "номеру" "field_genitive_case" => "номера" "field_nominative_case" => "номер" "field_prepositional_case" => "номере" ] "field_short_name" => "№" ] #original: array:6 [ "id" => 26 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "номер" "field_cases" => array:6 [ "field_accusative_case" => "номер" "field_creative_case" => "номером" "field_dative_case" => "номеру" "field_genitive_case" => "номера" "field_nominative_case" => "номер" "field_prepositional_case" => "номере" ] "field_short_name" => "№" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1035 #items: [] #escapeWhenCastingToString: false } "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1046 #items: array:1 [ 0 => App\Models\Branch {#1045 #connection: "mysql" #table: "branches" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 1424067 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_display_title" => "IV. Электромагнитные колебания" "field_branch_order" => null "field_url" => null "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1047 #items: [] #escapeWhenCastingToString: false } "field_page_start" => "21" "field_branch_display" => "0" "field_branch_expanded" => "0" "field_display_branch_in_title" => "1" "field_display_task_interval" => "0" "field_display_branch_page" => "1" "field_branch_title_in_content" => "0" "field_navigation_title" => null "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_branch_cover" => [] "field_branch_covers" => [] "book" => Illuminate\Database\Eloquent\Collection {#1081 #items: array:1 [ 0 => App\Models\Book {#1048 #connection: "mysql" #table: "books" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:50 [ "id" => 2549 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_tree_default_status" => "tasks" "field_pages_status" => null "field_subject" => Illuminate\Database\Eloquent\Collection {#1050 #items: array:1 [ 0 => App\Models\Term {#1049 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:10 [ "id" => 6493 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Физика" "field_abbreviated_name" => null "field_cases" => array:6 [ "field_accusative_case" => "физику" "field_creative_case" => "физикой" "field_dative_case" => "физике" "field_genitive_case" => "физики" "field_nominative_case" => "физика" "field_prepositional_case" => "физике" ] "field_foreign_lang_name" => null "field_short_name" => null "field_subject_type" => "technical_subject" "field_translit" => "fizika" ] #original: array:10 [ "id" => 6493 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Физика" "field_abbreviated_name" => null "field_cases" => array:6 [ "field_accusative_case" => "физику" "field_creative_case" => "физикой" "field_dative_case" => "физике" "field_genitive_case" => "физики" "field_nominative_case" => "физика" "field_prepositional_case" => "физике" ] "field_foreign_lang_name" => null "field_short_name" => null "field_subject_type" => "technical_subject" "field_translit" => "fizika" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_class" => Illuminate\Database\Eloquent\Collection {#1051 #items: array:1 [ 0 => App\Models\Term {#1052 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 5458 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "9" "field_cases" => array:6 [ "field_accusative_case" => "девятый" "field_creative_case" => "девятым" "field_dative_case" => "девятому" "field_genitive_case" => "девятого" "field_nominative_case" => "девятый" "field_prepositional_case" => "девятом" ] "field_translit" => "devjatyj" ] #original: array:6 [ "id" => 5458 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "9" "field_cases" => array:6 [ "field_accusative_case" => "девятый" "field_creative_case" => "девятым" "field_dative_case" => "девятому" "field_genitive_case" => "девятого" "field_nominative_case" => "девятый" "field_prepositional_case" => "девятом" ] "field_translit" => "devjatyj" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_publisher" => Illuminate\Database\Eloquent\Collection {#1053 #items: array:1 [ 0 => App\Models\Term {#1054 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 5153 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Просвещение" "field_cases" => null "field_translit" => "prosveschenie" ] #original: array:6 [ "id" => 5153 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Просвещение" "field_cases" => null "field_translit" => "prosveschenie" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_author" => Illuminate\Database\Eloquent\Collection {#1055 #items: array:3 [ 0 => App\Models\Term {#1056 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:12 [ "id" => 3745 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Артеменков" "field_bio" => null "field_degree_rp" => null "field_foreign_lang_name" => null "field_foreign_lang_patronymic" => null "field_foreign_lang_surname" => null "field_name" => "Денис" "field_patronymic" => "Александрович" "field_surname_rp" => null ] #original: array:12 [ "id" => 3745 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Артеменков" "field_bio" => null "field_degree_rp" => null "field_foreign_lang_name" => null "field_foreign_lang_patronymic" => null "field_foreign_lang_surname" => null "field_name" => "Денис" "field_patronymic" => "Александрович" "field_surname_rp" => null ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 1 => App\Models\Term {#1057 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:12 [ "id" => 5014 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Ломаченков" "field_bio" => null "field_degree_rp" => null "field_foreign_lang_name" => null "field_foreign_lang_patronymic" => null "field_foreign_lang_surname" => null "field_name" => "Иван" "field_patronymic" => "Алексеевич" "field_surname_rp" => null ] #original: array:12 [ "id" => 5014 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Ломаченков" "field_bio" => null "field_degree_rp" => null "field_foreign_lang_name" => null "field_foreign_lang_patronymic" => null "field_foreign_lang_surname" => null "field_name" => "Иван" "field_patronymic" => "Алексеевич" "field_surname_rp" => null ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 2 => App\Models\Term {#1058 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:12 [ "id" => 5412 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Панебратцев" "field_bio" => null "field_degree_rp" => null "field_foreign_lang_name" => null "field_foreign_lang_patronymic" => null "field_foreign_lang_surname" => null "field_name" => "Юрий" "field_patronymic" => "Анатольевич" "field_surname_rp" => "Панебратцева" ] #original: array:12 [ "id" => 5412 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Панебратцев" "field_bio" => null "field_degree_rp" => null "field_foreign_lang_name" => null "field_foreign_lang_patronymic" => null "field_foreign_lang_surname" => null "field_name" => "Юрий" "field_patronymic" => "Анатольевич" "field_surname_rp" => "Панебратцева" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1059 #items: [] #escapeWhenCastingToString: false } "field_book_type" => Illuminate\Database\Eloquent\Collection {#1060 #items: array:1 [ 0 => App\Models\Term {#1061 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:10 [ "id" => 6518 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Задачник" "field_book_type_foreign" => null "field_cases" => array:6 [ "field_accusative_case" => "задачник" "field_creative_case" => "задачником" "field_dative_case" => "задачнику" "field_genitive_case" => "задачника" "field_nominative_case" => "задачник" "field_prepositional_case" => "задачнике" ] "field_plural_form" => null "field_short_name" => null "field_short_name_foreign" => null "field_translit" => "zadachnik" ] #original: array:10 [ "id" => 6518 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Задачник" "field_book_type_foreign" => null "field_cases" => array:6 [ "field_accusative_case" => "задачник" "field_creative_case" => "задачником" "field_dative_case" => "задачнику" "field_genitive_case" => "задачника" "field_nominative_case" => "задачник" "field_prepositional_case" => "задачнике" ] "field_plural_form" => null "field_short_name" => null "field_short_name_foreign" => null "field_translit" => "zadachnik" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_country" => Illuminate\Database\Eloquent\Collection {#1062 #items: array:1 [ 0 => App\Models\Term {#1063 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 9 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Россия" "field_cases" => array:6 [ "field_accusative_case" => null "field_creative_case" => null "field_dative_case" => null "field_genitive_case" => null "field_nominative_case" => null "field_prepositional_case" => null ] "field_translit" => "rossiya" ] #original: array:6 [ "id" => 9 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Россия" "field_cases" => array:6 [ "field_accusative_case" => null "field_creative_case" => null "field_dative_case" => null "field_genitive_case" => null "field_nominative_case" => null "field_prepositional_case" => null ] "field_translit" => "rossiya" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_city" => Illuminate\Database\Eloquent\Collection {#1064 #items: array:1 [ 0 => App\Models\Term {#1065 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 15 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Москва" "field_cases" => array:6 [ "field_accusative_case" => null "field_creative_case" => null "field_dative_case" => null "field_genitive_case" => null "field_nominative_case" => null "field_prepositional_case" => null ] "field_translit" => "moskva" ] #original: array:6 [ "id" => 15 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Москва" "field_cases" => array:6 [ "field_accusative_case" => null "field_creative_case" => null "field_dative_case" => null "field_genitive_case" => null "field_nominative_case" => null "field_prepositional_case" => null ] "field_translit" => "moskva" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_series" => Illuminate\Database\Eloquent\Collection {#1066 #items: array:1 [ 0 => App\Models\Term {#1067 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:8 [ "id" => 4795 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "сферы" "field_cases" => null "field_foreign_lang_series" => null "field_transcription_eng" => null "field_translit" => "sfery" ] #original: array:8 [ "id" => 4795 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "сферы" "field_cases" => null "field_foreign_lang_series" => null "field_transcription_eng" => null "field_translit" => "sfery" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_umk" => Illuminate\Database\Eloquent\Collection {#1068 #items: [] #escapeWhenCastingToString: false } "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1069 #items: [] #escapeWhenCastingToString: false } "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1070 #items: [] #escapeWhenCastingToString: false } "field_publication_number" => "2" "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1071 #items: array:1 [ 0 => App\Models\Term {#1072 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 37 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "переработанное и дополненное" "field_cases" => array:6 [ "field_accusative_case" => null "field_creative_case" => null "field_dative_case" => null "field_genitive_case" => null "field_nominative_case" => null "field_prepositional_case" => null ] "field_translit" => "pererabotannoe i dopolnennoe" ] #original: array:6 [ "id" => 37 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "переработанное и дополненное" "field_cases" => array:6 [ "field_accusative_case" => null "field_creative_case" => null "field_dative_case" => null "field_genitive_case" => null "field_nominative_case" => null "field_prepositional_case" => null ] "field_translit" => "pererabotannoe i dopolnennoe" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1073 #items: array:1 [ 0 => App\Models\Term {#1058} ] #escapeWhenCastingToString: false } "field_under_the_edition_degree" => null "field_cover_description" => null "field_publication_year" => "2011" "field_publication_year_until" => null "field_part" => "" "field_part_writing" => "" "field_second_foreign_language" => null "field_for_whom" => "Учебное пособие для общеобразовательных организаций" "field_allowed" => null "field_reserve_field" => null "field_link_to_source" => null "field_tasks_count" => "278" "field_priority" => null "field_default_folder" => "/fizika_09/artemenkov-z/" "field_isbn" => "978-5-09-038216-8" "field_cover" => array:1 [ 0 => "/media/fizika_09/artemenkov-z/covers/cover1.webp?ts=1758483621" ] "field_cover_alts" => array:1 [ 0 => "" ] "field_covers" => array:1 [ 0 => array:4 [ "path" => "/media/fizika_09/artemenkov-z/covers/cover1.webp?ts=1758483621" "alt" => "" "width" => "1888" "height" => "2427" ] ] "field_popular_book" => "0" "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1074 #items: [] #escapeWhenCastingToString: false } "field_new_book" => Illuminate\Database\Eloquent\Collection {#1075 #items: [] #escapeWhenCastingToString: false } "field_old_book" => Illuminate\Database\Eloquent\Collection {#1076 #items: [] #escapeWhenCastingToString: false } "field_url" => "/9-klass/fizika/artemenkov-zadachnik" "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1077 #items: array:1 [ 0 => App\Models\Term {#1078 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 49 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "синий" "field_cases" => array:6 [ "field_accusative_case" => null "field_creative_case" => null "field_dative_case" => null "field_genitive_case" => null "field_nominative_case" => null "field_prepositional_case" => null ] "field_translit" => "siniy" ] #original: array:6 [ "id" => 49 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "синий" "field_cases" => array:6 [ "field_accusative_case" => null "field_creative_case" => null "field_dative_case" => null "field_genitive_case" => null "field_nominative_case" => null "field_prepositional_case" => null ] "field_translit" => "siniy" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "breadcrumbs" => array:3 [ "class" => 380 "subject" => 556 "class_subject" => 493 ] ] #original: array:50 [ "id" => 2549 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_tree_default_status" => "tasks" "field_pages_status" => null "field_subject" => Illuminate\Database\Eloquent\Collection {#1050} "field_class" => Illuminate\Database\Eloquent\Collection {#1051} "field_publisher" => Illuminate\Database\Eloquent\Collection {#1053} "field_author" => Illuminate\Database\Eloquent\Collection {#1055} "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1059} "field_book_type" => Illuminate\Database\Eloquent\Collection {#1060} "field_country" => Illuminate\Database\Eloquent\Collection {#1062} "field_city" => Illuminate\Database\Eloquent\Collection {#1064} "field_series" => Illuminate\Database\Eloquent\Collection {#1066} "field_umk" => Illuminate\Database\Eloquent\Collection {#1068} "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1069} "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1070} "field_publication_number" => "2" "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1071} "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1073} "field_under_the_edition_degree" => null "field_cover_description" => null "field_publication_year" => "2011" "field_publication_year_until" => null "field_part" => "" "field_part_writing" => "" "field_second_foreign_language" => null "field_for_whom" => "Учебное пособие для общеобразовательных организаций" "field_allowed" => null "field_reserve_field" => null "field_link_to_source" => null "field_tasks_count" => "278" "field_priority" => null "field_default_folder" => "/fizika_09/artemenkov-z/" "field_isbn" => "978-5-09-038216-8" "field_cover" => array:1 [ 0 => "/media/fizika_09/artemenkov-z/covers/cover1.webp?ts=1758483621" ] "field_cover_alts" => array:1 [ 0 => "" ] "field_covers" => array:1 [ 0 => array:4 [ "path" => "/media/fizika_09/artemenkov-z/covers/cover1.webp?ts=1758483621" "alt" => "" "width" => "1888" "height" => "2427" ] ] "field_popular_book" => "0" "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1074} "field_new_book" => Illuminate\Database\Eloquent\Collection {#1075} "field_old_book" => Illuminate\Database\Eloquent\Collection {#1076} "field_url" => "/9-klass/fizika/artemenkov-zadachnik" "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1077} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "breadcrumbs" => array:3 [ "class" => 380 "subject" => 556 "class_subject" => 493 ] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "branch_parent" => Illuminate\Database\Eloquent\Collection {#1079 #items: [] #escapeWhenCastingToString: false } ] #original: array:24 [ "id" => 1424067 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_display_title" => "IV. Электромагнитные колебания" "field_branch_order" => null "field_url" => null "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1047} "field_page_start" => "21" "field_branch_display" => "0" "field_branch_expanded" => "0" "field_display_branch_in_title" => "1" "field_display_task_interval" => "0" "field_display_branch_page" => "1" "field_branch_title_in_content" => "0" "field_navigation_title" => null "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_branch_cover" => [] "field_branch_covers" => [] "book" => Illuminate\Database\Eloquent\Collection {#1081} "branch_parent" => Illuminate\Database\Eloquent\Collection {#1079} ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "parent_branches" => Illuminate\Database\Eloquent\Collection {#1038 #items: array:1 [ 0 => App\Models\Branch {#1045} ] #escapeWhenCastingToString: false } "content" => Illuminate\Database\Eloquent\Collection {#1034 #items: array:2 [ 0 => App\Models\Element {#1085 #connection: "mysql" #table: "elements" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:7 [ "id" => 1673802 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1094 #items: array:1 [ 0 => App\Models\Edition {#1086 #connection: "mysql" #table: "editions" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:21 [ "id" => 5990 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Условие" "field_order" => "1" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1088 #items: array:1 [ 0 => App\Models\Term {#1087 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 5153 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Просвещение" "field_cases" => null "field_translit" => "prosveschenie" ] #original: array:6 [ "id" => 5153 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Просвещение" "field_cases" => null "field_translit" => "prosveschenie" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_content_type" => "free" "field_content_mode" => "text, image" "field_page_content_mode" => "image" "field_content_text_checked" => null "field_page_content_text_checked" => "0" "field_solution_author" => "Автор" "field_moderator" => "stas" "field_edition_type" => "statement" "field_root_dir" => "0-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1089 #items: [] #escapeWhenCastingToString: false } "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1090 #items: [] #escapeWhenCastingToString: false } "field_process_formula" => "katex" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1091 #items: [] #escapeWhenCastingToString: false } "field_content_source" => null ] #original: array:21 [ "id" => 5990 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Условие" "field_order" => "1" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1088} "field_content_type" => "free" "field_content_mode" => "text, image" "field_page_content_mode" => "image" "field_content_text_checked" => null "field_page_content_text_checked" => "0" "field_solution_author" => "Автор" "field_moderator" => "stas" "field_edition_type" => "statement" "field_root_dir" => "0-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1089} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1090} "field_process_formula" => "katex" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1091} "field_content_source" => null ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "task" => array:2 [ "refs" => "1424184" "type" => "task" ] "text" => "<p><strong>4.1</strong> Определите значение индукции магнитного поля, действующего на проводник с током длиной 10 см с силой 100 мН. Сила тока в проводнике 20 А. Проводник расположен перпендикулярно линиям магнитной индукции.</p>" "img" => array:1 [ 0 => array:5 [ "name" => "1-1.jpg" "alt" => null "width" => "1717" "height" => 328 "path" => "/media/fizika_09/artemenkov-z/0-4/1-1.webp?ts=1758726388" ] ] ] #original: array:7 [ "id" => 1673802 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1094} "task" => array:2 [ "refs" => "1424184" "type" => "task" ] "text" => "<p><strong>4.1</strong> Определите значение индукции магнитного поля, действующего на проводник с током длиной 10 см с силой 100 мН. Сила тока в проводнике 20 А. Проводник расположен перпендикулярно линиям магнитной индукции.</p>" "img" => array:1 [ 0 => array:5 [ "name" => "1-1.jpg" "alt" => null "width" => "1717" "height" => 328 "path" => "/media/fizika_09/artemenkov-z/0-4/1-1.webp?ts=1758726388" ] ] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 1 => App\Models\Element {#1092 #connection: "mysql" #table: "elements" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 1695344 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1102 #items: array:1 [ 0 => App\Models\Edition {#1093 #connection: "mysql" #table: "editions" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:21 [ "id" => 6166 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Решение" "field_order" => "2" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1096 #items: array:1 [ 0 => App\Models\Term {#1095 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 7012 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Gemini 2.5 Pro" "field_cases" => array:6 [ "field_accusative_case" => null "field_creative_case" => null …4 ] "field_translit" => "gemini 2.5 pro" ] #original: array:6 [ "id" => 7012 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Gemini 2.5 Pro" "field_cases" => array:6 [ …6] "field_translit" => "gemini 2.5 pro" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_content_type" => "free" "field_content_mode" => "text" "field_page_content_mode" => "" "field_content_text_checked" => null "field_page_content_text_checked" => "0" "field_solution_author" => "Gemini 2.5 Pro" "field_moderator" => "tolik" "field_edition_type" => "solution" "field_root_dir" => "1-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1097 #items: [] #escapeWhenCastingToString: false } "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1098 #items: [] #escapeWhenCastingToString: false } "field_process_formula" => "katex" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1099 #items: [] #escapeWhenCastingToString: false } "field_content_source" => null ] #original: array:21 [ "id" => 6166 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Решение" "field_order" => "2" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1096} "field_content_type" => "free" "field_content_mode" => "text" "field_page_content_mode" => "" "field_content_text_checked" => null "field_page_content_text_checked" => "0" "field_solution_author" => "Gemini 2.5 Pro" "field_moderator" => "tolik" "field_edition_type" => "solution" "field_root_dir" => "1-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1097} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1098} "field_process_formula" => "katex" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1099} "field_content_source" => null ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "task" => array:2 [ "refs" => "1424184" "type" => "task" ] "text" => "<p><strong>Дано:</strong></p><p>Длина проводника, $l = 10$ см</p><p>Сила, действующая на проводник (сила Ампера), $F_A = 100$ мН</p><p>Сила тока в проводнике, $I = 20$ А</p><p>Угол между проводником и линиями магнитной индукции, $\alpha = 90^\circ$</p><p><em>Перевод в систему СИ:</em></p><p>$l = 10 \text{ см} = 0.1 \text{ м}$</p><p>$F_A = 100 \text{ мН} = 100 \cdot 10^{-3} \text{ Н} = 0.1 \text{ Н}$</p><p><strong>Найти:</strong></p><p>Значение индукции магнитного поля, $B$ - ?</p><p><strong>Решение:</strong></p><p>Сила, действующая на проводник с током в магнитном поле (сила Ампера), определяется по формуле:</p><p>$F_A = I \cdot B \cdot l \cdot \sin(\alpha)$</p><p>где $I$ — сила тока, $B$ — индукция магнитного поля, $l$ — длина активной части проводника, а $\alpha$ — угол между направлением тока и вектором магнитной индукции.</p><p>По условию задачи проводник расположен перпендикулярно линиям магнитной индукции, следовательно, угол $\alpha = 90^\circ$.</p><p>Синус 90 градусов равен единице: $\sin(90^\circ) = 1$.</p><p>Тогда формула для силы Ампера упрощается до вида:</p><p>$F_A = I \cdot B \cdot l$</p><p>Выразим из этой формулы искомую величину — индукцию магнитного поля $B$:</p><p>$B = \frac{F_A}{I \cdot l}$</p><p>Подставим числовые значения из условия задачи, переведенные в систему СИ:</p><p>$B = \frac{0.1 \text{ Н}}{20 \text{ А} \cdot 0.1 \text{ м}} = \frac{0.1}{2} \text{ Тл} = 0.05 \text{ Тл}$</p><p>Индукцию магнитного поля можно также выразить в миллитеслах (мТл):</p><p>$0.05 \text{ Тл} = 50 \text{ мТл}$</p><p><strong>Ответ:</strong> значение индукции магнитного поля равно $0.05$ Тл.</p>" ] #original: array:6 [ "id" => 1695344 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1102} "task" => array:2 [ "refs" => "1424184" "type" => "task" ] "text" => "<p><strong>Дано:</strong></p><p>Длина проводника, $l = 10$ см</p><p>Сила, действующая на проводник (сила Ампера), $F_A = 100$ мН</p><p>Сила тока в проводнике, $I = 20$ А</p><p>Угол между проводником и линиями магнитной индукции, $\alpha = 90^\circ$</p><p><em>Перевод в систему СИ:</em></p><p>$l = 10 \text{ см} = 0.1 \text{ м}$</p><p>$F_A = 100 \text{ мН} = 100 \cdot 10^{-3} \text{ Н} = 0.1 \text{ Н}$</p><p><strong>Найти:</strong></p><p>Значение индукции магнитного поля, $B$ - ?</p><p><strong>Решение:</strong></p><p>Сила, действующая на проводник с током в магнитном поле (сила Ампера), определяется по формуле:</p><p>$F_A = I \cdot B \cdot l \cdot \sin(\alpha)$</p><p>где $I$ — сила тока, $B$ — индукция магнитного поля, $l$ — длина активной части проводника, а $\alpha$ — угол между направлением тока и вектором магнитной индукции.</p><p>По условию задачи проводник расположен перпендикулярно линиям магнитной индукции, следовательно, угол $\alpha = 90^\circ$.</p><p>Синус 90 градусов равен единице: $\sin(90^\circ) = 1$.</p><p>Тогда формула для силы Ампера упрощается до вида:</p><p>$F_A = I \cdot B \cdot l$</p><p>Выразим из этой формулы искомую величину — индукцию магнитного поля $B$:</p><p>$B = \frac{F_A}{I \cdot l}$</p><p>Подставим числовые значения из условия задачи, переведенные в систему СИ:</p><p>$B = \frac{0.1 \text{ Н}}{20 \text{ А} \cdot 0.1 \text{ м}} = \frac{0.1}{2} \text{ Тл} = 0.05 \text{ Тл}$</p><p>Индукцию магнитного поля можно также выразить в миллитеслах (мТл):</p><p>$0.05 \text{ Тл} = 50 \text{ мТл}$</p><p><strong>Ответ:</strong> значение индукции магнитного поля равно $0.05$ Тл.</p>" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "next" => array:2 [ "refs" => "1424185" "type" => "task" ] "previous" => array:2 [ "refs" => "1424183" "type" => "task" ] "book" => Illuminate\Database\Eloquent\Collection {#1082 #items: array:1 [ 0 => App\Models\Book {#1048} ] #escapeWhenCastingToString: false } "page" => Illuminate\Database\Eloquent\Collection {#1043 #items: array:1 [ 0 => App\Models\BookPage {#1080 #connection: "mysql" #table: "book_pages" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:21 [ "id" => 1424371 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "21" "field_url" => "/9-klass/fizika/artemenkov-zadachnik/page-21" "field_display_title" => "21" "field_folder" => "1" "field_image_name" => "21" "field_branch_parent" => Illuminate\Database\Eloquent\Collection {#1100 #items: [] #escapeWhenCastingToString: false } "field_weight" => "0" "field_book_parent" => Illuminate\Database\Eloquent\Collection {#1101 #items: array:1 [ 0 => App\Models\Book {#1048} ] #escapeWhenCastingToString: false } "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "edition_groups" => Illuminate\Database\Eloquent\Collection {#1103 #items: [] #escapeWhenCastingToString: false } "content" => Illuminate\Database\Eloquent\Collection {#1113 #items: array:1 [ 0 => App\Models\Element {#1112 #connection: "mysql" #table: "elements" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 1674181 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1114 #items: array:1 [ 0 => App\Models\Edition {#1086} ] #escapeWhenCastingToString: false } "book_page" => array:2 [ "refs" => "1424371" "type" => "book_page" ] "img" => array:1 [ 0 => array:5 [ "name" => "21-1.jpg" "alt" => null "width" => "1994" "height" => 2505 "path" => "/media/fizika_09/artemenkov-z/0-1/21-1.webp?ts=1758727968" ] ] ] #original: array:6 [ "id" => 1674181 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1114} "book_page" => array:2 [ "refs" => "1424371" "type" => "book_page" ] "img" => array:1 [ 0 => array:5 [ "name" => "21-1.jpg" "alt" => null "width" => "1994" "height" => 2505 "path" => "/media/fizika_09/artemenkov-z/0-1/21-1.webp?ts=1758727968" ] ] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "next" => array:2 [ "refs" => "1424372" "type" => "book_page" ] "previous" => array:2 [ "refs" => "1424370" "type" => "book_page" ] "tasks" => Illuminate\Database\Eloquent\Collection {#1168 #items: array:5 [ 0 => App\Models\Task {#1180 #connection: "mysql" #table: "tasks" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 1424184 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "21" "field_page_end" => null "field_url" => "/9-klass/fizika/artemenkov-zadachnik/4-1" "field_display_title" => "4.1" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1181 #items: array:1 [ 0 => App\Models\Term {#1036} ] #escapeWhenCastingToString: false } "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1182 #items: [] #escapeWhenCastingToString: false } "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1183 #items: array:1 [ 0 => App\Models\Branch {#1045} ] #escapeWhenCastingToString: false } "parent_branches" => Illuminate\Database\Eloquent\Collection {#1184 #items: array:1 [ 0 => App\Models\Branch {#1045} ] #escapeWhenCastingToString: false } "content" => Illuminate\Database\Eloquent\Collection {#1185 #items: array:2 [ 0 => App\Models\Element {#1085} 1 => App\Models\Element {#1092} ] #escapeWhenCastingToString: false } "next" => array:2 [ "refs" => "1424185" "type" => "task" ] "previous" => array:2 [ "refs" => "1424183" "type" => "task" ] "book" => Illuminate\Database\Eloquent\Collection {#1186 #items: array:1 [ 0 => App\Models\Book {#1048} ] #escapeWhenCastingToString: false } "page" => array:2 [ "refs" => "1424371" "type" => "book_page" ] ] #original: array:24 [ "id" => 1424184 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "21" "field_page_end" => null "field_url" => "/9-klass/fizika/artemenkov-zadachnik/4-1" "field_display_title" => "4.1" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1181} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1182} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1183} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1184} "content" => Illuminate\Database\Eloquent\Collection {#1185} "next" => array:2 [ "refs" => "1424185" "type" => "task" ] "previous" => array:2 [ "refs" => "1424183" "type" => "task" ] "book" => Illuminate\Database\Eloquent\Collection {#1186} "page" => array:2 [ "refs" => "1424371" "type" => "book_page" ] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 1 => App\Models\Task {#1187 #connection: "mysql" #table: "tasks" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 1424185 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "21" "field_page_end" => null "field_url" => "/9-klass/fizika/artemenkov-zadachnik/4-2" "field_display_title" => "4.2" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1188 #items: array:1 [ 0 => App\Models\Term {#1036} ] #escapeWhenCastingToString: false } "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1189 #items: [] #escapeWhenCastingToString: false } "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1190 #items: array:1 [ 0 => App\Models\Branch {#1045} ] #escapeWhenCastingToString: false } "parent_branches" => Illuminate\Database\Eloquent\Collection {#1191 #items: array:1 [ 0 => App\Models\Branch {#1045} ] #escapeWhenCastingToString: false } "content" => Illuminate\Database\Eloquent\Collection {#1193 #items: array:2 [ 0 => App\Models\Element {#1202 #connection: "mysql" #table: "elements" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:7 [ "id" => 1673803 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1203 …2} "task" => array:2 [ …2] "text" => "<p><strong>4.2</strong> Определите значение силы, действующей на проводник с током длиной 0,5 м, по которому течёт ток силой 2 А. Индукция магнитного поля 200 мТл. Проводник расположен перпендикулярно линиям магнитного поля.</p>" "img" => array:1 [ …1] ] #original: array:7 [ "id" => 1673803 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1203 …2} "task" => array:2 [ …2] "text" => "<p><strong>4.2</strong> Определите значение силы, действующей на проводник с током длиной 0,5 м, по которому течёт ток силой 2 А. Индукция магнитного поля 200 мТл. Проводник расположен перпендикулярно линиям магнитного поля.</p>" "img" => array:1 [ …1] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 1 => App\Models\Element {#1204 #connection: "mysql" #table: "elements" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 1695345 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1205 …2} "task" => array:2 [ …2] "text" => "<p><strong>Дано:</strong></p><p>Длина проводника $l = 0,5$ м</p><p>Сила тока $I = 2$ А</p><p>Индукция магнитного поля $B = 200$ мТл</p><p>Угол между проводником и линиями поля $\alpha = 90^\circ$</p><p>Перевод в систему СИ:</p><p>$B = 200 \cdot 10^{-3}$ Тл $= 0,2$ Тл</p><p><strong>Найти:</strong></p><p>Силу, действующую на проводник $F_A$</p><p><strong>Решение:</strong></p><p>Сила, которая действует на проводник с током в магнитном поле, называется силой Ампера. Для её вычисления используется формула:</p><p>$F_A = I \cdot B \cdot l \cdot \sin(\alpha)$</p><p>где $I$ — сила тока, $B$ — индукция магнитного поля, $l$ — длина активной части проводника, находящейся в поле, и $\alpha$ — угол между направлением тока и вектором магнитной индукции.</p><p>Из условия задачи известно, что проводник расположен перпендикулярно линиям магнитного поля. Это означает, что угол $\alpha$ равен $90^\circ$.</p><p>Синус угла $90^\circ$ равен единице:</p><p>$\sin(90^\circ) = 1$</p><p>С учётом этого формула для расчёта силы Ампера упрощается:</p><p>$F_A = I \cdot B \cdot l$</p><p>Теперь подставим числовые значения из условия, используя данные в системе СИ:</p><p>$F_A = 2 \text{ А} \cdot 0,2 \text{ Тл} \cdot 0,5 \text{ м} = 0,2 \text{ Н}$</p><p><strong>Ответ:</strong> значение силы, действующей на проводник, составляет 0,2 Н.</p>" ] #original: array:6 [ "id" => 1695345 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1205 …2} "task" => array:2 [ …2] "text" => "<p><strong>Дано:</strong></p><p>Длина проводника $l = 0,5$ м</p><p>Сила тока $I = 2$ А</p><p>Индукция магнитного поля $B = 200$ мТл</p><p>Угол между проводником и линиями поля $\alpha = 90^\circ$</p><p>Перевод в систему СИ:</p><p>$B = 200 \cdot 10^{-3}$ Тл $= 0,2$ Тл</p><p><strong>Найти:</strong></p><p>Силу, действующую на проводник $F_A$</p><p><strong>Решение:</strong></p><p>Сила, которая действует на проводник с током в магнитном поле, называется силой Ампера. Для её вычисления используется формула:</p><p>$F_A = I \cdot B \cdot l \cdot \sin(\alpha)$</p><p>где $I$ — сила тока, $B$ — индукция магнитного поля, $l$ — длина активной части проводника, находящейся в поле, и $\alpha$ — угол между направлением тока и вектором магнитной индукции.</p><p>Из условия задачи известно, что проводник расположен перпендикулярно линиям магнитного поля. Это означает, что угол $\alpha$ равен $90^\circ$.</p><p>Синус угла $90^\circ$ равен единице:</p><p>$\sin(90^\circ) = 1$</p><p>С учётом этого формула для расчёта силы Ампера упрощается:</p><p>$F_A = I \cdot B \cdot l$</p><p>Теперь подставим числовые значения из условия, используя данные в системе СИ:</p><p>$F_A = 2 \text{ А} \cdot 0,2 \text{ Тл} \cdot 0,5 \text{ м} = 0,2 \text{ Н}$</p><p><strong>Ответ:</strong> значение силы, действующей на проводник, составляет 0,2 Н.</p>" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "next" => array:2 [ "refs" => "1424186" "type" => "task" ] "previous" => array:2 [ "refs" => "1424184" "type" => "task" ] "book" => Illuminate\Database\Eloquent\Collection {#1199 #items: array:1 [ 0 => App\Models\Book {#1048} ] #escapeWhenCastingToString: false } "page" => array:2 [ "refs" => "1424371" "type" => "book_page" ] ] #original: array:24 [ "id" => 1424185 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "21" "field_page_end" => null "field_url" => "/9-klass/fizika/artemenkov-zadachnik/4-2" "field_display_title" => "4.2" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1188} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1189} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1190} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1191} "content" => Illuminate\Database\Eloquent\Collection {#1193} "next" => array:2 [ "refs" => "1424186" "type" => "task" ] "previous" => array:2 [ "refs" => "1424184" "type" => "task" ] "book" => Illuminate\Database\Eloquent\Collection {#1199} "page" => array:2 [ "refs" => "1424371" "type" => "book_page" ] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 2 => App\Models\Task {#1194 #connection: "mysql" #table: "tasks" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 1424186 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "21" "field_page_end" => null "field_url" => "/9-klass/fizika/artemenkov-zadachnik/4-3" "field_display_title" => "4.3" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1192 #items: array:1 [ 0 => App\Models\Term {#1036} ] #escapeWhenCastingToString: false } "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1201 #items: [] #escapeWhenCastingToString: false } "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1197 #items: array:1 [ 0 => App\Models\Branch {#1045} ] #escapeWhenCastingToString: false } "parent_branches" => Illuminate\Database\Eloquent\Collection {#1195 #items: array:1 [ 0 => App\Models\Branch {#1045} ] #escapeWhenCastingToString: false } "content" => Illuminate\Database\Eloquent\Collection {#1196 #items: array:2 [ 0 => App\Models\Element {#1214 #connection: "mysql" #table: "elements" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:7 [ "id" => 1673804 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1215 …2} "task" => array:2 [ …2] "text" => "<p><strong>4.3</strong> Определите длину проводника с током, помещённого в магнитное поле с индукцией 5 мТл, если на него со стороны магнитного поля действует сила 1,2 мН, а сила тока в проводнике 1 А. Проводник расположен перпендикулярно линиям магнитного поля.</p>" "img" => array:1 [ …1] ] #original: array:7 [ "id" => 1673804 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1215 …2} "task" => array:2 [ …2] "text" => "<p><strong>4.3</strong> Определите длину проводника с током, помещённого в магнитное поле с индукцией 5 мТл, если на него со стороны магнитного поля действует сила 1,2 мН, а сила тока в проводнике 1 А. Проводник расположен перпендикулярно линиям магнитного поля.</p>" "img" => array:1 [ …1] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 1 => App\Models\Element {#1216 #connection: "mysql" #table: "elements" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 1695346 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1217 …2} "task" => array:2 [ …2] "text" => "<p><strong>Дано:</strong></p><p>Индукция магнитного поля $B = 5 \text{ мТл} = 5 \cdot 10^{-3} \text{ Тл}$</p><p>Сила, действующая на проводник, $F = 1,2 \text{ мН} = 1,2 \cdot 10^{-3} \text{ Н}$</p><p>Сила тока $I = 1 \text{ А}$</p><p>Угол между направлением тока и вектором магнитной индукции $\alpha = 90^\circ$</p><p><strong>Найти:</strong></p><p>Длину проводника $L$</p><p><strong>Решение:</strong></p><p>На проводник с током в магнитном поле действует сила Ампера, которая рассчитывается по формуле:</p><p>$F = I \cdot B \cdot L \cdot \sin(\alpha)$</p><p>где $I$ — сила тока, $B$ — индукция магнитного поля, $L$ — длина проводника, находящегося в поле, а $\alpha$ — угол между направлением тока и вектором магнитной индукции.</p><p>Согласно условию, проводник расположен перпендикулярно линиям магнитного поля, поэтому угол $\alpha = 90^\circ$. Синус этого угла равен единице: $\sin(90^\circ) = 1$.</p><p>Следовательно, формула для силы Ампера принимает вид:</p><p>$F = I \cdot B \cdot L$</p><p>Чтобы найти длину проводника $L$, выразим ее из этой формулы:</p><p>$L = \frac{F}{I \cdot B}$</p><p>Теперь подставим заданные значения в полученную формулу:</p><p>$L = \frac{1,2 \cdot 10^{-3} \text{ Н}}{1 \text{ А} \cdot 5 \cdot 10^{-3} \text{ Тл}} = \frac{1,2}{5} \text{ м} = 0,24 \text{ м}$</p><p><strong>Ответ:</strong> длина проводника составляет 0,24 м.</p>" ] #original: array:6 [ "id" => 1695346 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1217 …2} "task" => array:2 [ …2] "text" => "<p><strong>Дано:</strong></p><p>Индукция магнитного поля $B = 5 \text{ мТл} = 5 \cdot 10^{-3} \text{ Тл}$</p><p>Сила, действующая на проводник, $F = 1,2 \text{ мН} = 1,2 \cdot 10^{-3} \text{ Н}$</p><p>Сила тока $I = 1 \text{ А}$</p><p>Угол между направлением тока и вектором магнитной индукции $\alpha = 90^\circ$</p><p><strong>Найти:</strong></p><p>Длину проводника $L$</p><p><strong>Решение:</strong></p><p>На проводник с током в магнитном поле действует сила Ампера, которая рассчитывается по формуле:</p><p>$F = I \cdot B \cdot L \cdot \sin(\alpha)$</p><p>где $I$ — сила тока, $B$ — индукция магнитного поля, $L$ — длина проводника, находящегося в поле, а $\alpha$ — угол между направлением тока и вектором магнитной индукции.</p><p>Согласно условию, проводник расположен перпендикулярно линиям магнитного поля, поэтому угол $\alpha = 90^\circ$. Синус этого угла равен единице: $\sin(90^\circ) = 1$.</p><p>Следовательно, формула для силы Ампера принимает вид:</p><p>$F = I \cdot B \cdot L$</p><p>Чтобы найти длину проводника $L$, выразим ее из этой формулы:</p><p>$L = \frac{F}{I \cdot B}$</p><p>Теперь подставим заданные значения в полученную формулу:</p><p>$L = \frac{1,2 \cdot 10^{-3} \text{ Н}}{1 \text{ А} \cdot 5 \cdot 10^{-3} \text{ Тл}} = \frac{1,2}{5} \text{ м} = 0,24 \text{ м}$</p><p><strong>Ответ:</strong> длина проводника составляет 0,24 м.</p>" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "next" => array:2 [ "refs" => "1424187" "type" => "task" ] "previous" => array:2 [ "refs" => "1424185" "type" => "task" ] "book" => Illuminate\Database\Eloquent\Collection {#1211 #items: array:1 [ 0 => App\Models\Book {#1048} ] #escapeWhenCastingToString: false } "page" => array:2 [ "refs" => "1424371" "type" => "book_page" ] ] #original: array:24 [ "id" => 1424186 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "21" "field_page_end" => null "field_url" => "/9-klass/fizika/artemenkov-zadachnik/4-3" "field_display_title" => "4.3" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1192} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1201} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1197} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1195} "content" => Illuminate\Database\Eloquent\Collection {#1196} "next" => array:2 [ "refs" => "1424187" "type" => "task" ] "previous" => array:2 [ "refs" => "1424185" "type" => "task" ] "book" => Illuminate\Database\Eloquent\Collection {#1211} "page" => array:2 [ "refs" => "1424371" "type" => "book_page" ] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 3 => App\Models\Task {#1206 #connection: "mysql" #table: "tasks" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 1424187 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "21" "field_page_end" => null "field_url" => "/9-klass/fizika/artemenkov-zadachnik/4-4" "field_display_title" => "4.4" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1198 #items: array:1 [ 0 => App\Models\Term {#1036} ] #escapeWhenCastingToString: false } "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1213 #items: [] #escapeWhenCastingToString: false } "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1209 #items: array:1 [ 0 => App\Models\Branch {#1045} ] #escapeWhenCastingToString: false } "parent_branches" => Illuminate\Database\Eloquent\Collection {#1207 #items: array:1 [ 0 => App\Models\Branch {#1045} ] #escapeWhenCastingToString: false } "content" => Illuminate\Database\Eloquent\Collection {#1208 #items: array:2 [ 0 => App\Models\Element {#1226 #connection: "mysql" #table: "elements" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:7 [ "id" => 1673805 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1227 …2} "task" => array:2 [ …2] "text" => "<p><strong>4.4</strong> Укажите направление векторов магнитной индукции в точках A, Б и B (рис. 9). Сделайте рисунок.</p><p>Рис. 9</p>" "img" => array:1 [ …1] ] #original: array:7 [ "id" => 1673805 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1227 …2} "task" => array:2 [ …2] "text" => "<p><strong>4.4</strong> Укажите направление векторов магнитной индукции в точках A, Б и B (рис. 9). Сделайте рисунок.</p><p>Рис. 9</p>" "img" => array:1 [ …1] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 1 => App\Models\Element {#1228 #connection: "mysql" #table: "elements" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 1695347 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1229 …2} "task" => array:2 [ …2] "text" => "<p><strong>Решение</strong></p><p>Для определения направления векторов магнитной индукции $ \vec{B} $ вокруг прямого проводника с током используется правило правой руки (или правило буравчика).</p><p>Правило гласит: если большой палец правой руки направить по направлению тока $I$ в проводнике, то четыре согнутых пальца, обхватывающие проводник, покажут направление линий магнитной индукции.</p><p>Вектор магнитной индукции $ \vec{B} $ в каждой точке пространства направлен по касательной к линии магнитной индукции, проходящей через эту точку. Линии магнитной индукции для прямого тока представляют собой концентрические окружности, лежащие в плоскости, перпендикулярной проводнику.</p><p>Применим это правило к нашей задаче:</p><p><strong>1.</strong> Направляем большой палец правой руки вверх, по направлению тока $I$.</p><p><strong>2.</strong> Согнутые пальцы укажут, что линии магнитной индукции направлены против часовой стрелки, если смотреть на проводник сверху.</p><p>Исходя из этого, определим направление векторов в заданных точках:</p><p><strong>В точке А:</strong> Точка А находится слева от проводника. Вектор магнитной индукции $ \vec{B_A} $, будучи касательным к окружности в этой точке, будет направлен перпендикулярно плоскости рисунка на наблюдателя (из-за плоскости). Такое направление принято обозначать знаком $ \odot $.</p><p><strong>В точке Б:</strong> Точка Б находится справа от проводника. Вектор магнитной индукции $ \vec{B_Б} $ в этой точке будет направлен перпендикулярно плоскости рисунка от наблюдателя (за плоскость). Такое направление принято обозначать знаком $ \otimes $.</p><p><strong>В точке В:</strong> Точка В, как и точка А, находится слева от проводника. Вектор магнитной индукции $ \vec{B_В} $ будет направлен так же, как и в точке А, то есть перпендикулярно плоскости рисунка на наблюдателя (из-за плоскости). Обозначение — $ \odot $.</p><p>Рисунок с указанием направлений векторов:</p><p><img src="data:image/svg+xml;base64,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" alt="Рисунок с указанием направления векторов магнитной индукции"></p><p><strong>Ответ:</strong> Вектор магнитной индукции в точке А направлен на нас (перпендикулярно плоскости рисунка). Вектор в точке Б направлен от нас (перпендикулярно плоскости рисунка). Вектор в точке В направлен на нас (перпендикулярно плоскости рисунка).</p>" ] #original: array:6 [ "id" => 1695347 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1229 …2} "task" => array:2 [ …2] "text" => "<p><strong>Решение</strong></p><p>Для определения направления векторов магнитной индукции $ \vec{B} $ вокруг прямого проводника с током используется правило правой руки (или правило буравчика).</p><p>Правило гласит: если большой палец правой руки направить по направлению тока $I$ в проводнике, то четыре согнутых пальца, обхватывающие проводник, покажут направление линий магнитной индукции.</p><p>Вектор магнитной индукции $ \vec{B} $ в каждой точке пространства направлен по касательной к линии магнитной индукции, проходящей через эту точку. Линии магнитной индукции для прямого тока представляют собой концентрические окружности, лежащие в плоскости, перпендикулярной проводнику.</p><p>Применим это правило к нашей задаче:</p><p><strong>1.</strong> Направляем большой палец правой руки вверх, по направлению тока $I$.</p><p><strong>2.</strong> Согнутые пальцы укажут, что линии магнитной индукции направлены против часовой стрелки, если смотреть на проводник сверху.</p><p>Исходя из этого, определим направление векторов в заданных точках:</p><p><strong>В точке А:</strong> Точка А находится слева от проводника. Вектор магнитной индукции $ \vec{B_A} $, будучи касательным к окружности в этой точке, будет направлен перпендикулярно плоскости рисунка на наблюдателя (из-за плоскости). Такое направление принято обозначать знаком $ \odot $.</p><p><strong>В точке Б:</strong> Точка Б находится справа от проводника. Вектор магнитной индукции $ \vec{B_Б} $ в этой точке будет направлен перпендикулярно плоскости рисунка от наблюдателя (за плоскость). Такое направление принято обозначать знаком $ \otimes $.</p><p><strong>В точке В:</strong> Точка В, как и точка А, находится слева от проводника. Вектор магнитной индукции $ \vec{B_В} $ будет направлен так же, как и в точке А, то есть перпендикулярно плоскости рисунка на наблюдателя (из-за плоскости). Обозначение — $ \odot $.</p><p>Рисунок с указанием направлений векторов:</p><p><img src="data:image/svg+xml;base64,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" alt="Рисунок с указанием направления векторов магнитной индукции"></p><p><strong>Ответ:</strong> Вектор магнитной индукции в точке А направлен на нас (перпендикулярно плоскости рисунка). Вектор в точке Б направлен от нас (перпендикулярно плоскости рисунка). Вектор в точке В направлен на нас (перпендикулярно плоскости рисунка).</p>" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "next" => array:2 [ "refs" => "1424188" "type" => "task" ] "previous" => array:2 [ "refs" => "1424186" "type" => "task" ] "book" => Illuminate\Database\Eloquent\Collection {#1223 #items: array:1 [ 0 => App\Models\Book {#1048} ] #escapeWhenCastingToString: false } "page" => array:2 [ "refs" => "1424371" "type" => "book_page" ] ] #original: array:24 [ "id" => 1424187 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "21" "field_page_end" => null "field_url" => "/9-klass/fizika/artemenkov-zadachnik/4-4" "field_display_title" => "4.4" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1198} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1213} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1209} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1207} "content" => Illuminate\Database\Eloquent\Collection {#1208} "next" => array:2 [ "refs" => "1424188" "type" => "task" ] "previous" => array:2 [ "refs" => "1424186" "type" => "task" ] "book" => Illuminate\Database\Eloquent\Collection {#1223} "page" => array:2 [ "refs" => "1424371" "type" => "book_page" ] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 4 => App\Models\Task {#1218 #connection: "mysql" #table: "tasks" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 1424188 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "21" "field_page_end" => null "field_url" => "/9-klass/fizika/artemenkov-zadachnik/4-5" "field_display_title" => "4.5" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1210 #items: array:1 [ 0 => App\Models\Term {#1036} ] #escapeWhenCastingToString: false } "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1225 #items: [] #escapeWhenCastingToString: false } "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1221 #items: array:1 [ 0 => App\Models\Branch {#1045} ] #escapeWhenCastingToString: false } "parent_branches" => Illuminate\Database\Eloquent\Collection {#1219 #items: array:1 [ 0 => App\Models\Branch {#1045} ] #escapeWhenCastingToString: false } "content" => Illuminate\Database\Eloquent\Collection {#1220 #items: array:2 [ 0 => App\Models\Element {#1238 #connection: "mysql" #table: "elements" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:7 [ "id" => 1673806 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1239 …2} "task" => array:2 [ …2] "text" => "<p><strong>4.5</strong> По рисунку 10 определите направление тока в проводнике.</p><p>Puc. 10</p>" "img" => array:1 [ …1] ] #original: array:7 [ "id" => 1673806 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1239 …2} "task" => array:2 [ …2] "text" => "<p><strong>4.5</strong> По рисунку 10 определите направление тока в проводнике.</p><p>Puc. 10</p>" "img" => array:1 [ …1] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 1 => App\Models\Element {#1240 #connection: "mysql" #table: "elements" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 1695348 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1241 …2} "task" => array:2 [ …2] "text" => "<p><strong>Решение</strong></p><p>Для определения направления электрического тока в проводнике, создающем магнитное поле, используется правило правой руки (также известное как правило буравчика). Это правило устанавливает связь между направлением тока в проводнике и направлением линий магнитной индукции создаваемого им поля.</p><p>Формулировка правила правой руки: если обхватить проводник правой рукой так, чтобы четыре пальца были направлены по направлению вектора магнитной индукции $\vec{B}$, то отставленный на 90 градусов большой палец укажет направление тока $I$ в проводнике.</p><p>На представленном рисунке 10 видно, что линии магнитной индукции (показаны пунктиром) направлены против часовой стрелки, если смотреть на торец проводника справа. Векторы магнитной индукции $\vec{B}$ касательны к этим линиям и указывают их направление.</p><p>Применим правило правой руки к данной задаче. Мысленно обхватим проводник правой рукой. Направим четыре пальца по направлению линий магнитной индукции, то есть против часовой стрелки. В этом случае большой палец будет указывать влево. Это и есть направление тока в проводнике.</p><p>Таким образом, ток в проводнике течет справа налево.</p><p><strong>Ответ:</strong> Ток в проводнике направлен справа налево.</p>" ] #original: array:6 [ "id" => 1695348 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1241 …2} "task" => array:2 [ …2] "text" => "<p><strong>Решение</strong></p><p>Для определения направления электрического тока в проводнике, создающем магнитное поле, используется правило правой руки (также известное как правило буравчика). Это правило устанавливает связь между направлением тока в проводнике и направлением линий магнитной индукции создаваемого им поля.</p><p>Формулировка правила правой руки: если обхватить проводник правой рукой так, чтобы четыре пальца были направлены по направлению вектора магнитной индукции $\vec{B}$, то отставленный на 90 градусов большой палец укажет направление тока $I$ в проводнике.</p><p>На представленном рисунке 10 видно, что линии магнитной индукции (показаны пунктиром) направлены против часовой стрелки, если смотреть на торец проводника справа. Векторы магнитной индукции $\vec{B}$ касательны к этим линиям и указывают их направление.</p><p>Применим правило правой руки к данной задаче. Мысленно обхватим проводник правой рукой. Направим четыре пальца по направлению линий магнитной индукции, то есть против часовой стрелки. В этом случае большой палец будет указывать влево. Это и есть направление тока в проводнике.</p><p>Таким образом, ток в проводнике течет справа налево.</p><p><strong>Ответ:</strong> Ток в проводнике направлен справа налево.</p>" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "next" => array:2 [ "refs" => "1424189" "type" => "task" ] "previous" => array:2 [ "refs" => "1424187" "type" => "task" ] "book" => Illuminate\Database\Eloquent\Collection {#1235 #items: array:1 [ 0 => App\Models\Book {#1048} ] #escapeWhenCastingToString: false } "page" => array:2 [ "refs" => "1424371" "type" => "book_page" ] ] #original: array:24 [ "id" => 1424188 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "21" "field_page_end" => null "field_url" => "/9-klass/fizika/artemenkov-zadachnik/4-5" "field_display_title" => "4.5" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1210} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1225} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1221} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1219} "content" => Illuminate\Database\Eloquent\Collection {#1220} "next" => array:2 [ "refs" => "1424189" "type" => "task" ] "previous" => array:2 [ "refs" => "1424187" "type" => "task" ] "book" => Illuminate\Database\Eloquent\Collection {#1235} "page" => array:2 [ "refs" => "1424371" "type" => "book_page" ] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } ] #original: array:21 [ "id" => 1424371 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "21" "field_url" => "/9-klass/fizika/artemenkov-zadachnik/page-21" "field_display_title" => "21" "field_folder" => "1" "field_image_name" => "21" "field_branch_parent" => Illuminate\Database\Eloquent\Collection {#1100} "field_weight" => "0" "field_book_parent" => Illuminate\Database\Eloquent\Collection {#1101} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "edition_groups" => Illuminate\Database\Eloquent\Collection {#1103} "content" => Illuminate\Database\Eloquent\Collection {#1113} "next" => array:2 [ "refs" => "1424372" "type" => "book_page" ] "previous" => array:2 [ "refs" => "1424370" "type" => "book_page" ] "tasks" => Illuminate\Database\Eloquent\Collection {#1168} ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } ] #original: array:24 [ "id" => 1424184 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "21" "field_page_end" => null "field_url" => "/9-klass/fizika/artemenkov-zadachnik/4-1" "field_display_title" => "4.1" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1037} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1035} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1046} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1038} "content" => Illuminate\Database\Eloquent\Collection {#1034} "next" => array:2 [ "refs" => "1424185" "type" => "task" ] "previous" => array:2 [ "refs" => "1424183" "type" => "task" ] "book" => Illuminate\Database\Eloquent\Collection {#1082} "page" => array:2 [ "refs" => "1424371" "type" => "book_page" ] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] }
№4.1 (с. 21)
Условие. №4.1 (с. 21)
Решение. №4.1 (с. 21)
Дано:
Длина проводника, $l = 10$ см
Сила, действующая на проводник (сила Ампера), $F_A = 100$ мН
Сила тока в проводнике, $I = 20$ А
Угол между проводником и линиями магнитной индукции, $\alpha = 90^\circ$
Перевод в систему СИ:
$l = 10 \text{ см} = 0.1 \text{ м}$
$F_A = 100 \text{ мН} = 100 \cdot 10^{-3} \text{ Н} = 0.1 \text{ Н}$
Найти:
Значение индукции магнитного поля, $B$ - ?
Решение:
Сила, действующая на проводник с током в магнитном поле (сила Ампера), определяется по формуле:
$F_A = I \cdot B \cdot l \cdot \sin(\alpha)$
где $I$ — сила тока, $B$ — индукция магнитного поля, $l$ — длина активной части проводника, а $\alpha$ — угол между направлением тока и вектором магнитной индукции.
По условию задачи проводник расположен перпендикулярно линиям магнитной индукции, следовательно, угол $\alpha = 90^\circ$.
Синус 90 градусов равен единице: $\sin(90^\circ) = 1$.
Тогда формула для силы Ампера упрощается до вида:
$F_A = I \cdot B \cdot l$
Выразим из этой формулы искомую величину — индукцию магнитного поля $B$:
$B = \frac{F_A}{I \cdot l}$
Подставим числовые значения из условия задачи, переведенные в систему СИ:
$B = \frac{0.1 \text{ Н}}{20 \text{ А} \cdot 0.1 \text{ м}} = \frac{0.1}{2} \text{ Тл} = 0.05 \text{ Тл}$
Индукцию магнитного поля можно также выразить в миллитеслах (мТл):
$0.05 \text{ Тл} = 50 \text{ мТл}$
Ответ: значение индукции магнитного поля равно $0.05$ Тл.
Другие задания:
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