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A parallel plate capacitor having plate ...

A parallel plate capacitor having plate area `A` and separation `4d` is connected to a battery of emf `V_(0)`. A diellectric slab of thickness `2d` and dielectric constant `2.0` is inserted into the gap. (a) find the increase in energy strored in capacitor. (b) Now battery is removed and dielectric slab taken out, find further increase in energy.

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