In case of circular motion a body, if tangential force also acts on the body in addition to centripetal force, then work done:

Options

A. by tangenitial force is zero by work done by centripetal force is not zero.
B. by tangenitial force is zero but work done by tangential force is not zero.
C. by both the forces is positive
D. by both the forces is zero

Answer

B

Explanation

Since there is no displacement along radius vector hence work done is zero by contripetal force, but for tangential force there is displacement `= 2 pi R`, so work done is not zero.