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

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Solution

Q.
The electrostatic potential on the surface of uniformly charged spherical shell of radius R = 10 cm is 120 V. The potential at the centre of shell, at a distance r = 5 cm from centre, and at a distance r = 15 cm from the centre of the shell respectively, are: [2025]

1 120 V, 120 V, 80 V

2 40 V, 40 V, 80 V

3 0 V, 0 V, 80 V

4 0 V, 120 V, 40 V

Ans.
(1)

Potential inside shell is equal to potential on surface

$V_{in} = V_{surface} = \frac{k Q}{R} = 120 V$

at r = 15 cm

$V = \frac{k Q}{r} = \frac{120 \times 10}{15} = 80 V$

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