If the potential at the centre of a uniformly charged hollow sphere of radius $R$ is $V$ then electric field at a distance $r$ from the centre of the sphere is $(r > R)$
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$\boxed{{\text{V}} = \frac{{{\text{kQ}}}}{{\text{R}}}\,}\, \Rightarrow {\text{E}} = \frac{{{\text{kQ}}}}{{{{\text{r}}^2}}}$
$\frac{V}{E}=\frac{r^{2}}{R} \Rightarrow E=\frac{V R}{r^{2}}$
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