Explanation

(c) If we take a charge from one point to another inside a charged spherical shell, then no work will be done. This means that inside a spherical charge the potential at all points is the same and its value is equal to that on the surface, that is
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$V = \frac{1}{4\pi\varepsilon_{0}}\frac{q}{R}\ volt$
Also outside the metallic sphere
$V = \frac{1}{4\pi\varepsilon_{0}}\ .\frac{q}{r}$
$V \propto \frac{1}{r}$