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
AIEEE 2007, Easy
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The potential energy of a charged capacitor before
removing the dielectric slat is $U=\frac{Q^{2}}{2 C}$.
The potential energy of the capacitor when the dielectric slat is first removed and the reinserted in the
gap between the plates is $U=\frac{Q^{2}}{2 C}$
There is no change in potential energy, therefore work done is zero.
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