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Question
Assertion

The force between two electric charges in a dielectric medium is less than it would be in a vacuum.

Reason

Quantity of energy stored in an electric field per unit volume of a dielectric medium is greater than that of vaccum

A

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

B

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

C

Assertion is correct but Reason is incorrect

D

Both Assertion and Reason are incorrect

Hard

Solution

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Correct option is
C

Assertion is correct but Reason is incorrect

Force between two charges in a dielectric medium,
where is the separation between two charges and .
Permitivity of the dielectric medium and that of vacuum is and , respectively.
And we know .
Hence Assertion is true.
Energy stored per unit volume of dielectric medium,
where
We know
Thus reason is incorrect.

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