Question

The capacitance of a parallel plate capacitor in air is . If a dielectric medium is placed between the plates then the potential difference reduces to of the original value. The dielectric constant of the medium is :

A

B

C

D

Medium

Solution

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Correct option is A)

As no battery is connected to the capacitor, the charge remains constant.
Before inserting the dielectric, the charge is
After inserting the dielectric, the capacitance become and hence charge
As the charge is constant ,



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