An infinite line charge of linear charge density = 1.5 C/m lies on the z axis.

An infinite line charge of linear charge density λ = 1.5 μC/m lies on the z axis. Find the potential at distances from the line charge of

(a) 2.0 m,

(b) 4.0 m, and

(c) 12 m, assuming that V = 0 at 2.5 m.