Rework Problem 4.50 if the diameter of each conductor is

(a) increased by \(25 \%\) to \(1.875 \mathrm{~cm}\) 

(b) decreased by \(25 \%\) to \(1.125 \mathrm{~cm}\) without changing the phase spacings. Compare the results with those of Problem 4.50.

Problem 4.50

Calculate the conductor surface electric field strength in \(\mathrm{kVrms} / \mathrm{cm}\) for the single-phase line in Problem 4.32 when the line is operating at \(20 \mathrm{kV}\). Also calculate the ground-level electric field strength in \(\mathrm{kVrms} / \mathrm{m}\) directly under one conductor. Assume a line height of \(10 \mathrm{~m}\).