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Question

Find charge on 12 nF which is in direct contact to battery (initially all capacitors are uncharged)

A
160 nC
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B
140 nC
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C
200 nC
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D
240 nC
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Solution

The correct option is A 160 nC


The given circuit is reduced to the circuits as shown above.

Wheatstone bridges with 5 nF & 18 nF do not get any charge. Now calculating the effective capacitance of the rest of the capacitors we get,
Ceff across battery is 40 nF.
q=CeffV=160 nC

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