Question

For a charged spherical ball, electrostatic potential inside the ball varies with r as V = 2ar² + b. Here, a and b are constant and r is the distance from the center. The volume charge density inside the ball is –λaε . The value of λ is ________. ε = permittivity of medium.

Answer 1

Correct answer is 12

Result inside uniformly charged solid sphere. 

ρ = -12aε₀

λ = 12