A hollow metal sphere of radius $5\,\, cm$ is charged so that the potential on its surface is $10\,\, V$. The potential at the centre of the sphere is.....$V$
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Hollow metal sphere $=$ spherical shell
Electric field inside shell $= O$
Potential in constant inside thin shell
potential at surface $=$ potential at centre
$=10 \mathrm{V}$
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