Consider the situation shown in the figure. The capacitor A has a charge q on it, whereas B is uncharged. The charge appearing on the capacitor B, after a long time of closing the switch is:
q2
zero
q
2q
A
zero
B
q2
C
q
D
2q
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Solution
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The charge on positive plate of A remains same.
∴ on the negative plate, amount of charge must be same. In above Gaussian surface, we know E in conductor is zero.
∴ total charge enclosed in Gaussian surface must be 0. ∴ charge cannot decrease from negative plate.
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