Question

# Two capacitors of $$3$$ $$\mu F$$ and $$6$$ $$\mu F$$ are connected in series and a potential difference of $$900$$V is applied across the combination. They are then disconnected and reconnected in parallel. The potential difference across the combination is?

A
Zero
B
100 V
C
200 V
D
400 V

Solution

## The correct option is B $$200$$ VInitial charge $$q=\left(\dfrac{3\times 6}{3+6}\right)900=1800\mu C$$Common potential $$V=\dfrac{Total \ charge}{Total \ capacity}$$$$=\dfrac{1800}{9}=200V$$.PhysicsNCERTStandard XII

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