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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

$(a)\;zero\qquad(b)\;positive\qquad(c)\;negative\qquad(d)\;zero\;if\;the\;charge\;Q\;is\;at\;the\;centre\;and\;non-zero\;otherwise$

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Answer : (a) zero
Explanation :
P. E is a state function and therefore it is same for both intial and final condition . Therefore work done in a complete revolution is zero .
answered Feb 5, 2014 by yamini.v
 

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