Question

The electrostatic potential inside a charged spherical ball is given by ϕ = ar² + b where r is the distance from the centre; a, b are constants. Then the charge density inside the ball is
(a) –24πaε₀r 

(b) –6aε₀r

(c) –24πaε₀ 

(d) –6aε₀

Answer 1

The correct answer is: