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Q.

The extra charge flowing through the cell on closing the key k is equal to

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a

CV4

b

4 CV

c

43CV

d

34CV

answer is A.

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Detailed Solution

Cnet =34C; when key was open q=34CVwhen key was closed 3C becomes short circuited. Net charge on C is now q' = CVΔq=q′−q=CV4

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