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A uniformly charged solid sphere of radius R has potential $V_0$ (measured with respect to $\infty$) on its surface. For this sphere the equipotential surfaces with potentials $\large\frac{3V_0}{2},\frac{5V_0}{4},\frac{3V_0}{4}$ and $\large\frac{V_0}{4}$ have radius $R_1, R_2, R_3$ and $R_4$ respectively . Then

$\begin{array}{1 1} R_1 =0\;and\; R_2 > (R_4-R_3) \\ R_1 \neq 0 \;and\;(R_2 -R_1) > (R_4- R_3) \\ R_1 =0\;and\;R_2< (R_4 -R_3) \\ 2R < R_4 \end{array} $

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