Q.

If a dielectric slab is just made to enter within a parallel plate capacitor, then the subsequent motion of the dielectric slab is

Difficult

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simple harmonic

periodic but not simple harmonic

non periodic

accelerated and non periodic

answer is B.

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Detailed Solution

The electrostatic force that acts on the slab ( between free charges on the capacitor plates and the bound charge on the dielectric slab ) is not proportional to displacement. Rather it is proportional to the potential difference applied across the battery which makes the acceleration constant. Hence the oscillation is general periodic oscillation but not simple harmonic

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