A charge `q_0` is distributed uniformly on a ring of radius R. A sphere of equal radius R constructed with its centre on the circumference of the ring. Find the electric flux through the surface of the sphere.

Answer

C

Explanation

(Total charge `=q_0)`
Charge on are `PQ` o ring `=q_0/3`
This is also the charge lying inside the closed sphere.
`:. phi`through closed sphere `=q_(in)/epsilon_0`
`=((q_0//3))/epsilon_0=q_0/(3epsilon_0)`