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Question

At t=0 , switch S1 is closed and remains closed for a long time and S2 remains open. Now S1 is opened and S2 is closed. Find out the charge on the capacitor long after that moment.


A
EC
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B
2EC
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C
3EC
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D
4EC
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Solution

The correct option is B 2EC
Just after the switch is closed the situation is like this


After a long time, i=0

Potential difference,

VBVA=VDVA=2E

So, charge on the capacitor after long time,

Q=C(2E0)=2EC

Hence, option (b) is the correct answer.

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