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The space between plates of a parallel p...

The space between plates of a parallel plate capacitor is filled by a dielectric and it is charged and then battery is removed. Now dielectric slab is slowly drawn out of the capacitor parallel to the plates. The variatiton of the potential of capacitor with respect to the length of the dielectric plate drawn out is

A

B

C

D

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The correct Answer is:
D
As slab is drawn out, capacitance decrease and hence potential increase. When slab is completely drawn out, potential becomes constant. Hence `(4)`.
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