Q.

In the arrangement will be the potential difference between the terminals A and B after the battery is removed and the switch S is closed ?

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a

3.33 volt

b

4 volt

c

5 volt

d

10 volt

answer is A.

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Detailed Solution

Total charge stored in the system is Q =  10×3×2+43+2+4μC=20μCafter the battery is removed and S is closed, total charge   in the system between A and B, is Q1 = Q = 20µC∴VAB=Q'2+4volt=206volt=3.33volt
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In the arrangement will be the potential difference between the terminals A and B after the battery is removed and the switch S is closed ?