Physics - Capacitor Question with Solution | TestHub

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