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+// Example 1.30
+
+clear; clc; close;
+format('v',7);
+// Given data
+R2=0.04;//in ohm
+X2=0.2;//in ohm
+TstByTm=50;//in %
+
+//Calculations
+Sm=1;//slip for max Torque
+R2dash=Sm*X2;//in ohm
+Rx=R2dash-R2;//in ohm
+disp(Rx,"(i) External resistance required for max Torque(ohm ): ");
+TstByTm=TstByTm/100;//in ratio
+//Formula : Tst proportional to E2^2*R2dash/(R2dash^2+X2^2)
+//Formula : Tm Proportional to E2^2/2/X2
+P=[TstByTm -2*X2 TstByTm*X2^2];//Polynomial for R2dash
+R2dash=roots(P);//
+R2dash=R2dash(2);//discarding higher value bcoc R2dash < X2
+Rx=R2dash-R2;//in ohm
+disp(Rx,"(ii) Extra resistance required for 50% max Torque at start(ohm) : ");