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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

Text Solution

Verified by Experts

The correct Answer is:
D
Initial energy `U_(i)=(1)/(2)kCV^(2)`
Final energy `U_(f)=(1)/(2)kCV^(2)`, because dielectric slab first slowly removed from the plate and then reinserted
`W=DeltaU=0`.
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