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A hollow metal sphere of radius $15 \mathrm{~cm}$ is charged such that potential on its surface is $20 \mathrm{~V}$. Then, the potential at the centre of sphere is
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20 V
Radius of hollow metallic sphere, $R=15 \mathrm{~cm}$ Potential on the surface, $V=20 \mathrm{~V}$.
For a hollow metallic sphere, there is no field inside the sphere but the potential is same everywhere.
$\therefore$ Potential at the centre is also $20 \mathrm{~V}$.
For a hollow metallic sphere, there is no field inside the sphere but the potential is same everywhere.
$\therefore$ Potential at the centre is also $20 \mathrm{~V}$.
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