A parallel plate capacitor of plate area A and plate separation d is charged to a potential difference V & then the battery disconnected. A slab of dielectric constant K is then inserted between the plates of the capacitor so as to fill the space between the plates. If Q, E & W denote respectively, the magnitude of the charge on each plate, the electric field between the plates (after the slab is inserted) & work done on the system, in question, in the process of inserting the slab, then
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