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A parallel plate condenser with a dielec...

A parallel plate condenser with a dielectric of dielectric constant K between the plates has a capacity C and is charged to a potential V volt. The dielectric slab is slowly removed from between the plates and then reinserted. The net work done by the system in this process is

A

`1/2(K-1)CV^(2)`

B

`CV^(2)(K-1)K`

C

`(K-1)CV^(2)`

D

zero

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The correct Answer is:
D
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