A plate of dielectric is passed slowly between the plates of a parallel plate capacitor connected to a battery as shown. The dielectric enters the space between the plates of the capacitor and leaves. During this process, the charge on the capacitor

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gradually increases reaching a maximum value

first increases and then decreases

first decreases and then increases

remains constant

answer is D.

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Detailed Solution

Here V is constant. During the entry of dielectric C increases and as the slab continues to move, when it starts coming out C decreases. Hence charge first increases reaches a maximum value then decreases.

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