Question

A spherical conducting shell of inner radius r₁ and outer radius r₂ has a charge Q. A charge q is placed at the centre of the shell. The surface charge density on outer surface of the shell is:

• A. $\frac{Q+q}{4πr_2^2}$
• B. $\frac{Q-q}{4πr_2^2}$
• C. $\frac{Q+q}{4π(r_2^2-r_1^2)}$
• D. $\frac{Q-q}{4π(r_2^2-r_1^2)}$

Answer 1

Answer: (A)

$\frac{Q+q}{4πr_2^2}$

Answer 2

The correct option is (A):

$\frac{Q+q}{4πr_2^2}$