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)
zero
• b)
• c)
• d)
(K - 1)CV2

### Related Test

The potential energy of a charged capacitor before removing the dielectric slat is U = Q2/2C.
The potential energy of the capacitor when the dielectric slat is first removed and the reinserted in the gap between the plates is U = Q2/2C
There is no change in potential energy, therefore work done is zero.

The potential energy of a charged capacitor before removing the dielectric slat is U = Q2/2C.The potential energy of the capacitor when the dielectric slat is first removed and the reinserted in the gap between the plates is U = Q2/2CThere is no change in potential energy, therefore work done is zero.

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