A ball with charge 50 e is placed at the centre of a hollow spherical shell which has a net charge of - 50 e. What is the charge on the shells outer surface?
A) -50e
B) Zero
C) -100e
D) +100e
Correct Answer:
D
Solution :
The net charge on the outer surface is \[-(50\,e-50e)=100\,e\]