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Уважаемые эксперты,помогите пожалуйста решить задачи. Скоро нужно сдавать, а не получается. Заранее спасибо! Очень надо.
1) На какое расстояние к заряду q1=2 мкКл приблизится движущийся из бесконечности со скоростью 10 км/с заряд q2=1 мкКл?
2) Конденсатор состоит из двух круглых пластин радиусом 10 см, разделенных, диэлектриком (E=7), толщиной 0,5 мм, разность потенциалов между обкладками 120 В. Определить заряд на пластинах и энергию конденсатора?
3) Электрическая цепь состоит из нагрузки сопротивлением 10 Ом и источника питания, ЭДС которого равна 12 В. Определить величину внутреннего сопротивления источника, если по цепи протекает ток 0,3 А.
4) Вольтметр рассчитан на измерение максимального напряжения 100 В. При этом через вольтметр идёт ток 10 мА. Какое дополнительное сопротивление нужно последовательно присоединить к вольтметру, чтобы им можно было измерять напряжение U=150 В?
Обсуждение
Неизвестный
16.02.2009, 14:25
общий
это ответ
Здравствуйте, Leshkinmaloy! Решение: 3) Согласно закону Ома для полной цепи: I = ЭДС/(R + r), R – сопротивление внешней нагрузки, r – внутреннее сопротивление источника тока. Откуда, разрешив относительно r, получим: I*R + I*r = ЭДС r = (ЭДС – I*R)/I. Подставив данные условия задачи, имеем: r = (12В – 0,3А*10 Ом)/0,3А = 30 Ом. Ответ: Внутреннее сопротивление источника равно 30 Ом.
Здравствуйте, Leshkinmaloy! 3) Полное сопротивление всей цепи 12/0.3 = 40 Ом. Вычитаем сопротивление нагрузки 10 Ом, остаётся на внутреннее сопротивление источника 40 - 10 = 30 Ом 4) Требуемое падение напряжения в дополнительном сопротивлении 150 - 100 = 50 В. Поскольку дополнительное сопротивление присоединено к вольтметру последовательно, через него идёт тот же самый ток 10 мА. Величина дополнительного сопротивления равна 50/10 = 5 кОм (5000 Ом).
Неизвестный
17.02.2009, 03:21
общий
1) На какое расстояние к заряду q1=2 мкКл приблизится движущийся из бесконечности со скоростью 10 км/с заряд q2=1 мкКл? Недостаточно данных. Надо знать массы зарядов.
2) Конденсатор состоит из двух круглых пластин радиусом 10 см, разделенных, диэлектриком (E=7), толщиной 0,5 мм, разность потенциалов между обкладками 120 В. Определить заряд на пластинах и энергию конденсатора? C= e*e0*S/d= 7*8.854e-12*pi*0.1^2/0.5e-3= 3,9E-9 Q= C*U= 3.9e-9*120= 4,7E-7 (Кл) E= C*U^2/2= 3.9e-9*120^2/2= 2,8E-5 (Дж)= 28 (мкДж)
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