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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
  1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  3. Assertion is correct but Reason is incorrect
  4. Both Assertion and Reason are incorrect

A
Both Assertion and Reason are incorrect
B
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
C
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
D
Assertion is correct but Reason is incorrect
Solution
Verified by Toppr

Force between two charges in a dielectric medium, F=q1q24πϵr2
where r is the separation between two charges q1 and q2.
Permitivity of the dielectric medium and that of vacuum is ϵ and ϵo, respectively.
And we know ϵ>ϵo.
F<Fo
Hence Assertion is true.
Energy stored per unit volume of dielectric medium, E=12CV2.1Ad
where C=Aϵd
E=12ϵV2d2
We know ϵ>ϵo
E>Eo
Thus reason is incorrect.

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