Q. 94.0( 8 Votes )

A point charge q is rotated along a circle in the electric field generated by another point charge Q. The work done by the electric field on the rotating charge in one complete revolution is
A. zero

B. positive

C. negative

D. zero if the charge Q is at the center and nonzero otherwise.

Answer :

If a force F applies on a body and it allows it to move an infinitely small distance d, then work done is given by dW=F.ds and for a path, integrate it putting lower limits (starting position) and upper limits (ending position).


Here, in the given question,


since a complete rotation is made i.e. net displacement is zero. i.e.



i.e. The work done by the electric field on the rotating charge in one complete revolution is zero.

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