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Figure shows a parallel-plate capacitor with plates of width b and length l. The separation between the plates is d. the plates are rigidly clamped and connected to a battery of emf V. A dielectric slab of thickness d and dielectric constant K is slowly inserted between the plates. What force should be applied on the slab to ensure that is goes slowly into the capacitor? Neglect any effect of friction or gravity.

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$\large\frac{\in_0 bV^2 [K-1]}{2d}$
answered Jun 21, 2014 by meena.p

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