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Q.

A point  charge Q is moved along a circular path around another fixed point charge. The work done is zero.

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a

only if Q returns to its starting point

b

only if the two charges have the same magnitude

c

only if the two charges have the same magnitude and opposite signs.

d

in all the above cases

answer is D.

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Circular path is equipotential
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A point  charge Q is moved along a circular path around another fixed point charge. The work done is zero.