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Консультация № 196269
31.08.2019, 13:49
0.00 руб.
1
4
1
Здравствуйте! Прошу помощи в следующем вопросе:
на рисунке показан график зависимости напряжения на конденсаторе емкостью 1 мкФ от времени в колебательном контуре. Определите полную энергию контура в момент времени 19,5 мкс
на рисунке показан график зависимости напряжения на конденсаторе емкостью 1 мкФ от времени в колебательном контуре. Определите полную энергию контура в момент времени 19,5 мкс
Прикрепленные файлы:
Обсуждение
02.09.2019, 09:08
общий
это ответ
Здравствуйте, dar777!
Из графика на Вашем рисунке видно, что в контуре происходят незатухающие колебания, при которых разность потенциалов между обкладками конденсатора
или напряжение 
определяется по формуле
где
-- заряд на обкладках конденсатора; 
-- ёмкость конденсатора; 
-- индуктивность катушки колебательного контура [1, с. 508 -- 509]. Согласно [1, с. 510], полная энергия контура при свободных колебаниях не изменяется со временем и равна энергии энергии электрического поля конденсатора при 
Из графика видно, что
В, поэтому в Вашем случае
(Дж)
(мкДж).
Литература
1. Яворский Б. М., Детлаф А. А., Лебедев А. К. Справочник по физике для инженеров и студентов вузов. -- М.: ООО "Издательство Оникс", 2007. -- 1056 с.
Из графика на Вашем рисунке видно, что в контуре происходят незатухающие колебания, при которых разность потенциалов между обкладками конденсатора
или напряжение определяется по формулегде
-- заряд на обкладках конденсатора; -- ёмкость конденсатора; -- индуктивность катушки колебательного контура [1, с. 508 -- 509]. Согласно [1, с. 510], полная энергия контура при свободных колебаниях не изменяется со временем и равна энергии энергии электрического поля конденсатора при Из графика видно, что
В, поэтому в Вашем случае (Дж) (мкДж).Литература
1. Яворский Б. М., Детлаф А. А., Лебедев А. К. Справочник по физике для инженеров и студентов вузов. -- М.: ООО "Издательство Оникс", 2007. -- 1056 с.
5
Это самое лучшее решение!
Об авторе:
Facta loquuntur.
Facta loquuntur.
02.09.2019, 12:22
общий
Адресаты:
dar777 Ответ 8 мкДж
После исправления ошибки у меня получилось в ответе 2 мкДж.
Об авторе:
Facta loquuntur.
Facta loquuntur.
08.09.2019, 03:22
общий
Адресаты:
В этой простой задаче главное сообразить, что в начальный момент энергия контура сосредоточена в катушке, а колебания в этом идеальном контуре - НЕзатухающие. Поэтому, энергия контура будет одинакова хоть "в момент времени 19,5 мкс", хоть в момент 219,5 мкс.
Значение этой энергии можно получить в момент, когда эта энергия перешла из катушки в конденсатор и зарядила его до напряжения U=2 Вольта :
W = C * U^2 / 2 = 1 * 2^2 / 2 = 2 мкДж
Значение этой энергии можно получить в момент, когда эта энергия перешла из катушки в конденсатор и зарядила его до напряжения U=2 Вольта :
W = C * U^2 / 2 = 1 * 2^2 / 2 = 2 мкДж
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