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Консультация № 195858
16.06.2019, 14:37
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Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
Металлический стержень длиной L вращается с угловой скоростью w вокруг точки О, лежащей на оси стержня на расстоянии а от его конца. Однородное магнитное поле В перпендикулярно плоскости вращения. Определить разность потенциалов U между концами стержня.
Металлический стержень длиной L вращается с угловой скоростью w вокруг точки О, лежащей на оси стержня на расстоянии а от его конца. Однородное магнитное поле В перпендикулярно плоскости вращения. Определить разность потенциалов U между концами стержня.
Обсуждение
19.06.2019, 16:44
общий
это ответ
Здравствуйте, student!
При вращении металлического стержня на каждый из его электронов со стороны магнитного поля действует сила
так, что тройка векторов 
скорости электрона, 
магнитной индукции, 
силы является правой. При этом сила направлена или от точки 
к концу стержня или от наоборот для обоих концов одновременно. Из-за смещения электронов между концами стержня возникает разность потенциалов.
Избыточные заряды на концах стержня создают электрическое поле, которое препятствует дальнейшему их разделению. На каждый электрон со стороны электрического поля действует сила
направленная противоположно силе 
При наступлении равновесия 
то есть 
(в расчёт принимаем среднюю скорость 
).
Для конца стержня, расположенного на расстоянии
от точки 
а для противоположного конца стержня
Тогда
Литература
Детлаф А. А., Яворский Б. М. Курс физики. -- М.: Высшая школа, 1989. -- 608 с.
При вращении металлического стержня на каждый из его электронов со стороны магнитного поля действует сила
так, что тройка векторов скорости электрона, магнитной индукции, силы является правой. При этом сила направлена или от точки к концу стержня или от наоборот для обоих концов одновременно. Из-за смещения электронов между концами стержня возникает разность потенциалов.Избыточные заряды на концах стержня создают электрическое поле, которое препятствует дальнейшему их разделению. На каждый электрон со стороны электрического поля действует сила
направленная противоположно силе При наступлении равновесия то есть (в расчёт принимаем среднюю скорость ).Для конца стержня, расположенного на расстоянии
от точки а для противоположного конца стержня
Тогда
Литература
Детлаф А. А., Яворский Б. М. Курс физики. -- М.: Высшая школа, 1989. -- 608 с.
Об авторе:
Facta loquuntur.
Facta loquuntur.
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