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+//Exa 3.1
+clc;
+clear;
+close;
+//Given data :
+P=30*10^6;//W
+pf=0.8;//lagging power factor
+VL=132*1000;//V
+l=120*1000;//m
+Eta=90/100;//Efficiency
+rho_Cu=1.78*10^-8;//ohm-m
+D_Cu=8.9*10^3;//kg/m^3
+rho_Al=2.6*10^-8;//ohm-m
+D_Al=2*10^3;//kg/m^3
+IL=P/(sqrt(3)*VL*pf);//A
+//W=3*IL^2*rho*l/a=(1-Eta)*P
+a_Cu=(3*IL^2*rho_Cu*l)/(1-Eta)/P;//m^2
+V_Cu=3*a_Cu*l;//m^3
+Wt_Cu=V_Cu*D_Cu;//kg
+disp(Wt_Cu,"Weight of copper required(kg)");
+a_Al=(3*IL^2*rho_Al*l)/(1-Eta)/P;//m^2
+V_Al=3*a_Al*l;//m^3
+Wt_Al=V_Al*D_Al;//kg
+disp(Wt_Al,"Weight of Alluminium required(kg)");
+//Answer in the textbook is not accurate.