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Консультация № 195709
24.05.2019, 13:40
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Здравствуйте! Прошу помощи в следующем вопросе:
Виток диаметром 8 см находится в однородном магнитном поле с на-
пряженностью 6 10 3 А/м. Плоскость витка перпендикулярна линиям индукции
поля. Какую работу надо совершить, чтобы повернуть виток около его диамет-
ра на угол 45 0 при силе тока в витке 4 А?
Виток диаметром 8 см находится в однородном магнитном поле с на-
пряженностью 6 10 3 А/м. Плоскость витка перпендикулярна линиям индукции
поля. Какую работу надо совершить, чтобы повернуть виток около его диамет-
ра на угол 45 0 при силе тока в витке 4 А?
Обсуждение
27.05.2019, 16:07
общий
это ответ
Здравствуйте, Servam!
Воспользуемся примером решения аналогичной задачи [1, с. 126 -- 127], считая, что при повороте витка сила тока в нём поддерживается неизменной.
На виток с током, помещённый в магнитное поле, действует вращающий момент
где
-- магнитный момент витка, 
-- индукция магнитного поля, 
-- угол между векторами 
и 
В начальном положении плоскость витка перпендикулярна линиям индукции. Следовательно, векторы и 
имеют одно и то же направление, то есть 
и 
При действии внешних сил возникает момент, величина которого определяется по формуле (1). Момент сил стремится возвратить виток в исходное положение. При повороте витка внешние силы совершают работу против этого момента, который является функцией угла поворота
Значит, 
(Дж).
Литература
1. Физика: в 2 ч. Ч. 2. / В. А. Груздев и др. -- Минск: РИВШ, 2009. -- 312 с.
Воспользуемся примером решения аналогичной задачи [1, с. 126 -- 127], считая, что при повороте витка сила тока в нём поддерживается неизменной.
На виток с током, помещённый в магнитное поле, действует вращающий момент
где
-- магнитный момент витка, -- индукция магнитного поля, -- угол между векторами и В начальном положении плоскость витка перпендикулярна линиям индукции. Следовательно, векторы
и имеют одно и то же направление, то есть и При действии внешних сил возникает момент, величина которого определяется по формуле (1). Момент сил стремится возвратить виток в исходное положение. При повороте витка внешние силы совершают работу против этого момента, который является функцией угла поворота
Значит, (Дж).Литература
1. Физика: в 2 ч. Ч. 2. / В. А. Груздев и др. -- Минск: РИВШ, 2009. -- 312 с.
Об авторе:
Facta loquuntur.
Facta loquuntur.
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