Q147 / 160 · TS EAMCET 2021 (06 Aug Shift 2) · Physics

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

  • A
    0 V
  • Correct answer
    B
    20 V
  • C
    10 V
  • D
    15 V

Solution

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 $20 \mathrm{~V}$.

Hence, the correct answer is option: 'B'.

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