# A capacitor of capacitance C is charged fully by connecting it to a battery of emf E. It is then disconnected from the battery. If the separation between the plates of the capacitor is then halved and a dielectric material of dielectric constant K is introduced between the plates, what will happen to (i) Potential difference across the plates (ii) Energy stored by the capacitor. Justify your answer in each case.

CV^2

### Energy stored by the capacitor is also reduce by the factor 2k

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