Question

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B

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# Both the potential difference and the stored energy remain the same

Medium

## Solution

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Correct option is D)

## When a dielectric is placed in an electric field then an internal electric field is produced in it due to polarisation of dielectric . This internal electric field inside the dielectric  is in opposite direction of the field between plates of capacitor , as a result of this effective electric field between plates decreases , hence the potential difference between plates because ,                                        ,where is the distance between plates , which is constant .Now potential energy of a capacitor is given by ,                                        ,charge is given constant , therefore due to decrease in potential difference , potential energy also decreases .

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