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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
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B
100 V
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C
200 V
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D
400 V
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Solution

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

Physics
NCERT
Standard XII

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