Assertion: Free charges given to a conductor ,comes to the surface because of repulsion of like charges.
Reason: The force of interaction between point charges decreases in inverse square proportion to the distance between them. 

 

A)BOTH A AND R ARE TRUE, AND R EXPLAINS A
B)BOTH A AND R ARE TRUE,BUT R DOES NOT EXPLAIN A
C)A IS TRUE ,BUT R IS FALSE
D)BOTH A AND R ARE FALSE
Please give a simple explanation too..

Dear student,
The electric field inside a conductor is zero, so the mutual repulsion acting between two similar charges forces them to reside on the surface of the conductor. According to Coulomb's law, with increasing distance between two charges, the magnitude of the electrostatic force acting decreases.
F=kq1q2r2where r is the separation between q1 and q2hence,F 1r2
so both the Assertion and Reason are true, and the reason explains assertion.

Regards

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