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Question

A parallel plate capacitor C carries a charge Q. The distance between the plates is doubled by application of force, the work done by force is

A
zero
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B
Q22C
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C
Q2C
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D
Q24C
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Solution

The correct option is B Q22C

Energy before separation,

E=Q22C

Energy after separation,

E=Q2C

Work done is difference in energy

W=Q22C


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