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Консультация № 198004
20.03.2020, 15:30
0.00 руб.
0
3
1
Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
Зная, что напряженность однородного магнитного ноля в вольфраме H = 10 А/м, определить магнитную индукцию поля, обусловленную намагничиванием.
О т в е т: В = 4π∙10^-6 Тл.
Зная, что напряженность однородного магнитного ноля в вольфраме H = 10 А/м, определить магнитную индукцию поля, обусловленную намагничиванием.
О т в е т: В = 4π∙10^-6 Тл.
Обсуждение
21.03.2020, 07:57
общий
это ответ
Здравствуйте, dar777!
Дано : напряженность магнитного поля H = 10 А/м,
Вычислить магнитную индукцию B .
Решение : Магнитная индукция связана с напряжённостью магнитного поля простым соотношением:
B = µ0·µ·H
Здесь µ0 = 4[$960$]·10-7 Гн/м - Магнитная постоянная ,
µ - магнитная проницаемость намагниченного материала. Цитирую : "Значение магнитной проницаемости вольфрама равняется μ=1,0176…" (см "Магнитная проницаемость и магнитная восприимчивость вещества" Ссылка1 )
Значит, искомая магнитная индукция поля
B = µ0·µ·H = 4[$960$]·10-7·1,0176·10 [$8776$] 1,279·10-5 Тл .
Ответ : магнитная индукция поля равна 1,28·10-5 Тл
В Ответе из Условия задачи точность чуть хуже, тк указанное в нём 4[$960$]·10-6 [$8776$] 1,257·10-5
Ответы совпадают при округлении до 2х значащих цифр т-ко.
Дано : напряженность магнитного поля H = 10 А/м,
Вычислить магнитную индукцию B .
Решение : Магнитная индукция связана с напряжённостью магнитного поля простым соотношением:
B = µ0·µ·H
Здесь µ0 = 4[$960$]·10-7 Гн/м - Магнитная постоянная ,
µ - магнитная проницаемость намагниченного материала. Цитирую : "Значение магнитной проницаемости вольфрама равняется μ=1,0176…" (см "Магнитная проницаемость и магнитная восприимчивость вещества" Ссылка1 )
Значит, искомая магнитная индукция поля
B = µ0·µ·H = 4[$960$]·10-7·1,0176·10 [$8776$] 1,279·10-5 Тл .
Ответ : магнитная индукция поля равна 1,28·10-5 Тл
В Ответе из Условия задачи точность чуть хуже, тк указанное в нём 4[$960$]·10-6 [$8776$] 1,257·10-5
Ответы совпадают при округлении до 2х значащих цифр т-ко.
5
Это самое лучшее решение!
21.03.2020, 10:25
общий
Адресаты:
Если Вам нужно, чтобы Ваш Ответ совпал с Ответом, заданным в Условии задачи, тогда не надо использовать хорошие вычислители (Маткад, Инженерный калькулятор…), не надо искать точные справочные данные для вольфрама. Достаточно упрощённо принять µ=1 для всех диа-/пара-магнетиков, и тогда выражение
B = µ0·µ·H = 4[$960$]·10-7·1·10 = 4[$960$]·10-6
возвращает мало-точный ответ-полу-фабрикат (в недоделанном формате) в угоду недобросовестным авторам задачи с ответом.
B = µ0·µ·H = 4[$960$]·10-7·1·10 = 4[$960$]·10-6
возвращает мало-точный ответ-полу-фабрикат (в недоделанном формате) в угоду недобросовестным авторам задачи с ответом.
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