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Q.

Seven capacitors, a switch S and a source of e.m.f are connected as shown in the figure. Initially, S is open and all capacitors are uncharged. After S is closed and steady state is attained, the potential difference in volt across the plates of the capacitor 7μF is :

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a

17

b

12

c

15

d

19

answer is A.

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Detailed Solution

The equivalent network is: 

Question Image

Let q = change on each capacitor,
Then q21+q7+q28+q3+q7=59
⇒  q=84μC
∴  P.D across A=q7=847=12V

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