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Q.

A capacitor of capacitance C is initially charged to a potential difference of V volt. Now, it is connected to a battery of 2V with opposite polarity. The heat developed is. 

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a

32CV2

b

92CV2

c

CV2

d

94CV2

answer is B.

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Detailed Solution

Initial charge -CV, final charge +2CV, charge supplied by batter is 3CV.

        Heat liberated = work done by battery - ∆U

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