Question 65: Electrostats & Capacitance

Question

When a metallic spherical shell of radius 20 cm is charged, the potential on its surface is found to be 5 V . The potential at a point 10 cm from the centre of the spherical shell is :

Accepted Answer

The key fact is that, for a charged conducting shell, the potential is the same everywhere inside as it is on the surface.
Ã¢ÂÂ¢ Let the shellÃ¢ÂÂs radius be $R=0.20$ m and its surface potential $V(R)=5$ V.
Ã¢ÂÂ¢ For any point with $r
$$     V(r)=V(R)=5	ext{ V}.   $$
Since 10 cm = 0.10 m is inside the shell, the potential there is also
5 V
.
Answer: Option D (5 V)

Answer

10 V

Answer

2.5 V

Answer

1.25 V

Answer

5 V

Electrostats & Capacitance

When a metallic spherical shell of radius 20 cm is charged, the potential on its surface is found to be 5 V . The potential at a point 10 cm from the centre of the spherical shell is :

Choose the correct answer: