Rework Problem 4.50 if the diameter of each conductor is: (a) increased by 25 % 25 %

Rework Problem 4.50 if the diameter of each conductor is: (a) increased by $25\%$ to $1.875cm$, (b) decreased by $25\%$ to $1.125cm$, without changing the phase spacings. Compare the results with those of Problem 4.50.

Data From Problem 4.50:-

Calculate the conductor surface electric field strength in ${kV}_{rms}/cm$ for the singlephase line when the line is operating at $20kV$. Also calculate the ground-level electric field strength in ${kV}_{\text{rms}}/m$ directly under one conductor. Assume a line height of $10m$.