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Question

A unit charge is rotated around a charge of q in a circular path at the distance of r. Then, work done will be:

A
$$ 2 \pi r J $$
B
zero
C
$$ 2 \pi r q $$
D
$$ \dfrac{1}{4 \pi \varepsilon_{0}} \dfrac{q}{r^{2}} J $$
Solution
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Correct option is A. zero
(a) zero.
Circular path will act like an equipotential surface. So work done in moving unit charge will be zero.

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