Question

4.33 Show that the electric potential difference V12 between two points in air at radial distances r1 and r2 from an infinite line of charge with density pl along the

z axis is V_{12}=\left(\rho_{\ell} / 2 \pi \varepsilon_{0}\right) \ln \left(r_{2} / r_{1}\right)

Fig: 1

Fig: 2