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A variable condenser is permanently conn...

A variable condenser is permanently connected to a 100 V battery. If capacity is changed from `2 mu F` to `10 mu F` then energy change is equal to

A

`2 xx 10^-2 J`

B

`2.5 xx 10^-2 J`

C

`6.5 xx 10^-2 J`

D

`4 xx 10^-2 J`

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