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(A) For a uniformly charged spherical shell,the electrostatic potential inside the shell is constant and equal to the potential on its surface.Given:

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$120 \ V, 120 \ V, 80 \ V$

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(A) For a uniformly charged spherical shell,the electrostatic potential inside the shell is constant and equal to the potential on its surface.Given: Potential on the surface $V_{surface} = 120 \ V$ and radius $R = 10 \ cm$.$1$. At the centre $(r = 0 \ cm)$: Since $r $2$. At a distance $r = 5 \ cm$ from the centre: Since $r $3$. At a distance $r = 15 \ cm$ from the centre: Since $r > R$,the shell acts as a point charge. The potential is given by $V = \frac{kQ}{r}$.We know $V_{surface} = \frac{kQ}{R} = 120 \ V$,so $kQ = 120 	imes 10 = 1200 \ V \cdot cm$.Thus,$V_{r=15cm} = \frac{1200}{15} = 80 \ V$.Therefore,the potentials are $120 \ V, 120 \ V, 80 \ V$.

The electrostatic potential on the surface of a uniformly charged spherical shell of radius $R = 10 \ cm$ is $120 \ V$. The potential at the centre of the shell,at a distance $r = 5 \ cm$ from the centre,and at a distance $r = 15 \ cm$ from the centre of the shell respectively,are:

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