A parallel plate capacitor has smooth square plates of side ''a''. It is charged by a battery so that, the charge density becomes sigma. After charging, the battery is disconnected. Now a smooth dielectric slab of length a which can fill the space between the plates is introduced between the plates from one side between the plates. .

A parallel plate capacitor has smooth square plates of side ''a''. It

1.	A parallel plate capacitor has smooth square plates of side ''a''. It is charged by a battery so that, the charge density becomes sigma. After charging, the battery is disconnected. Now a smooth dielectric slab of length a which can fill the space between the plates is introduced between the plates from one side between the plates. .
Answer» The slab can EXECUTE `SHM` between the plates. The plate can execute OSCILLATORY motion which is not `SHM` The magnitude of the FORCE EXPERIENCED by the slab is constant The magnitude of the force experienced by the slab is not constant. Solution :Force on the slab is GIVEN by `F=(dU)/(dx)`, where `U` is slab in it. Here `F` is not directly proportional to `x`, but depends on `x`.

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