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Консультация № 186582
02.09.2012, 11:16
0.00 руб.
02.09.2012, 18:58
0
1
1
Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
Между пластинами плоского конденсатора находится плотно прилегающая стеклянная пластинка толщиной 5 мм с диэлектрической проницаемостью, равной 6. Конденсатор заряжен до разности потенциалов U1 = 300 В и отключен от источника. Какова будет разность потенциалов U2, если вытащить стеклянную пластинку из конденсатора? Определить объемную плотность энергии электрического поля в начальном состоянии.
Между пластинами плоского конденсатора находится плотно прилегающая стеклянная пластинка толщиной 5 мм с диэлектрической проницаемостью, равной 6. Конденсатор заряжен до разности потенциалов U1 = 300 В и отключен от источника. Какова будет разность потенциалов U2, если вытащить стеклянную пластинку из конденсатора? Определить объемную плотность энергии электрического поля в начальном состоянии.
Обсуждение
02.09.2012, 14:44
общий
это ответ
Здравствуйте, Massimo!
Как известно, диэлектрическая проницаемость
показывает, во сколько раз модуль напряжённости электростатического поля 
внутри однородного диэлектрика меньше модуля напряжённости поля 
, созданного теми же зарядами в вакууме. Кроме того, разность потенциалов 
пропорциональна 
а 
пропорциональна 
Поэтому если вытащить стеклянную пластинку из конденсатора, разность потенциалов между его пластинами увеличится в 
раз и составит 
Для нахождения объёмной плотности энергии электрического поля конденсатора в начальном состоянии воспользуемся следующими формулами:
и получим
Ответ: 1800 В; 0,956 Дж/м3.
С уважением.
Как известно, диэлектрическая проницаемость
показывает, во сколько раз модуль напряжённости электростатического поля внутри однородного диэлектрика меньше модуля напряжённости поля , созданного теми же зарядами в вакууме. Кроме того, разность потенциалов пропорциональна а пропорциональна Поэтому если вытащить стеклянную пластинку из конденсатора, разность потенциалов между его пластинами увеличится в раз и составит Для нахождения объёмной плотности энергии электрического поля конденсатора в начальном состоянии воспользуемся следующими формулами:
и получим
Ответ: 1800 В; 0,956 Дж/м3.
С уважением.
5
Большое спасибо!!!
Об авторе:
Facta loquuntur.
Facta loquuntur.
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