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Консультация № 194435
16.01.2019, 13:14
0.00 руб.
16.01.2019, 18:50
0
1
1
Здравствуйте! У меня возникли сложности с таким вопросом:
Обсуждение
20.01.2019, 23:55
общий
это ответ
Здравствуйте, Светлана!
1) До сообщения пластине 1 заряда пластины 2 и 3 образуют обыкновенный плоский конденсатор и имеют заряд
q3=-q2=[$963$]S=[$8496$][$949$]0S/d
2) после замыкания ключа имеем систему из трёх заряженных пластин (обозначим заряды q1, q2 и q3), напряжённости поля между которыми (принимая за положительное направление от первой пластины к третьей)
E1-2=(q1-q2-q3)/2[$949$]0S
E2-3=(q1+q2-q3)/2[$949$]0S
Поскольку ключ замкнут, потенциал пластин 1 и 2 равен и напряжённость между ними E1-2=0
Разность потенциалов между пластинами 2 и 3 равна электродвижущей силе, откуда E2-3=-[$8496$]/d
а сумма зарядов q1+q2+q3=q0
q1+q2-q3=q0-2q3=E2-3[$183$]2[$949$]0S=-2[$8496$][$949$]0S/d
q3=[$8496$][$949$]0S/d+q0/2
Стоит также отметить, что поскольку перераспределение заряда между пластинами 1 и 2 не влияет на напряжённость между пластинами 2 и 3, этот заряд на пластине 3 установится уже при зарядке пластины 1 и не изменится при замыкании ключа
1) До сообщения пластине 1 заряда пластины 2 и 3 образуют обыкновенный плоский конденсатор и имеют заряд
q3=-q2=[$963$]S=[$8496$][$949$]0S/d
2) после замыкания ключа имеем систему из трёх заряженных пластин (обозначим заряды q1, q2 и q3), напряжённости поля между которыми (принимая за положительное направление от первой пластины к третьей)
E1-2=(q1-q2-q3)/2[$949$]0S
E2-3=(q1+q2-q3)/2[$949$]0S
Поскольку ключ замкнут, потенциал пластин 1 и 2 равен и напряжённость между ними E1-2=0
Разность потенциалов между пластинами 2 и 3 равна электродвижущей силе, откуда E2-3=-[$8496$]/d
а сумма зарядов q1+q2+q3=q0
q1+q2-q3=q0-2q3=E2-3[$183$]2[$949$]0S=-2[$8496$][$949$]0S/d
q3=[$8496$][$949$]0S/d+q0/2
Стоит также отметить, что поскольку перераспределение заряда между пластинами 1 и 2 не влияет на напряжённость между пластинами 2 и 3, этот заряд на пластине 3 установится уже при зарядке пластины 1 и не изменится при замыкании ключа
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