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Здравствуйте!Помогите, пожалуйста, с задачей. Буду очень благодарна.
Расстояние между пластинами плоского конденсатора равно 8 мм, площадь пластин 62,8 см^2. Какую работу нужно затратить, чтобы вдвинуть между пластинами конденсатора пластинку из стекла той же площади и толщиной 6 мм, если пластины конденсатора присоединены к источнику напряжения 600В?
Дано: d1 = 8 мм = 8 ∙ 10-3 м, S = 62,8 см2 = 62,8 ∙ 10-4 м2, ε1 = 1, ε2 = 10, d2 = 6 мм = 6 ∙ 10-3 м, U = 600 В. Определить: A.
Решение.
Искомая работа A равна изменению ∆W энергии конденсатора A = ∆W = U2/2 ∙ (C2 – C1), где C1 – емкость конденсатора до вдвигания пластинки из стекла, C2 – емкость конденсатора после вдвигания пластинки.
redroza: Да, диэлектрическая проницаемость стекла равна 5 ... 10. Я принял ее равной 10. А диэлектрическая проницаемость воздуха почти не отличается от 1.
Нюанс лишь в том, кто совершает эту работу. Энергия конденсaтора увеличивается на (C2-C1)U^2/2, но при перемещении заряда (C2-C1)U источник напряжения совершает работу (C2-C1)U^2. Итого стекло будет затянуто в конденсатор электрическим полем, а механическую работу (C2-C1)U^2/2 придётся совершить, чтобы его оттуда вытащить.
redroza: Честно говоря, объяснять долго. Вы можете покопаться в Сети и найти примеры решения задач по физике из сборника Чертова. Та есть подобные задачи.
А что, Вам на лекциях преподаватели (или на уроках учителя) ничего не объясняют?
redroza: Саму формулу в общем виде Вы можете найти здесь. Остается только выполнить небольшие преобразования применительно к условию задачи. А почему Вы не стремитесь во всем разобраться сами?
Об авторе:
Facta loquuntur.
Форма ответа
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