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(C) The electric potential $V$ at a distance $r$ from a point charge $Q$ is given by $V = \frac{1}{4\pi\varepsilon_0} \frac{Q}{r}$.Since the charge $q

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(C) The electric potential $V$ at a distance $r$ from a point charge $Q$ is given by $V = \frac{1}{4\pi\varepsilon_0} \frac{Q}{r}$.Since the charge $q$ is moved in a circle of radius $r$ around the charge $Q$,every point on the circular path is at the same distance $r$ from $Q$.Therefore,the entire circular path acts as an equipotential surface.The work done $W$ in moving a charge $q$ between two points on an equipotential surface is given by $W = q(V_f - V_i)$.Since $V_f = V_i$,the work done $W = 0$.

On rotating a point charge having a charge $q$ around a charge $Q$ in a circle of radius $r$,the work done will be:

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