On rotating a point charge having a charge $q$ around a charge $Q$ in a circle of radius $r$. The work done will be
AIIMS 1997, Easy
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$(A)$ $E_A^{\text {lnside }}=0$
$(B)$ $Q_A > Q_B$
$(C)$ $\frac{\sigma_A}{\sigma_B}=\frac{R_B}{R_A}$
$(D)$ $E_A^{\text {on sulface }} < E_B^{\text {on uurface }}$