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
12
b
15
c
17
d
19
answer is A.
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Detailed Solution
The equivalent network is: Let q = change on each capacitor,Then q21+q7+q28+q3+q7=59⇒ q=84μC∴ P.D across A=q7=847=12V
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 :