Question

A conducting shell has a charge of +10e at its surface. A charge of -20e is given at the centre of the shell. What is the net charge on the outer surface of the shell?
(a) +10e
(b) –20e
(c) – 10e
(d) zero​

Answer 1

Answer:

The answer is -10e as all the charge on a shell is concentrated at its surface and there is no charge inside the sphere.

Explanation:

Answer 2

The charge on the outer surface can be calculated by the process of induction.

• As given the charge on the inner surface is - 20e.
• At the conduction shell surface the charge is +10e
• Now to calculate the net charge we simply add the both charges
• -20+10=-10e
• That is -10e charge will be outer surface.
• Here property of distribution came which tells that when the charge is present at the center then inner charge are equally distributed, uniformly
• But in non-uniform, it does not matter on the outer surface. The outer surface  will be distributed evenly.