There is a uniformly charged non conducting solid sphere made of material of dielectric constant one. If electric potential at infinity be zero, then the potential at its surface is $V$. If we take electric potential at its surface to be zero, then the potential at the centre will be
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(b)
$V_{\text {surface }}=V+V_{-}$
$\text {If } V_{-}=0, V_{\text {surface }}=V$
$\text { If } V_{-}=-V, V_{\text {surface }}=0$
$V_{\text {cen }}=\frac{3 V}{2}+V_{-}=\frac{3 V}{2}-V=\frac{V}{2}$
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