A very long positively charged wire on which the linear charge density \(\lambda\) is \(150 \mathrm{nC} / \mathrm{m}\) lies on the \(z\) axis of a rectangular coordinate system. Calculate the electrostatic potential

(a) 2.0 m

(b) 4. 0 m, and

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