Q.

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

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a

by tangential force is zero by work done by centripetal force is not zero.

b

by both the forces is positive

c

by centripetal force is zero but work done by tangential force is not zero

d

by both the forces is zero

answer is C.

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Detailed Solution

In circular motion centripetal force is always perpendicular to instantaneous displacement, whereas tangential force is along the displacement.

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