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A parallel plate capacitor having capaci...

A parallel plate capacitor having capacitance 12pF is charged bya battery to a potential difference of 10V between its plates. The charging battery is now disonnected and a porcelain slab of dielectric constant 6.5 is slipped between the plates. The work done by the capacitor on the slab is

A

560pJ

B

692pJ

C

508pJ

D

600pJ

Text Solution

Verified by Experts

The correct Answer is:
C
`DeltaU=Q^(2)[(1)/(2kc)-(1)/(2c)]=(5.5xxc^(2)E^(2))/(6.5xx2c)=-508xx10^(-12)J,W=-DeltaU=508xx10^(-12)J=508pJ`
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