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+//Problem 43.13:For the coupled circuit shown in Figure 43.16, determiine the values of currents I1 and I2.
+
+//initializing the variables:
+E1 = 250; // in Volts
+thetae1 = 0; // in degrees
+R1 = %i*50; // in ohm
+R2 = 10; // in ohm
+R3 = 10; // in ohm
+R4 = %i*50; // in ohm
+R5 = 50; // in ohm
+M = %i*10; // in ohm
+
+//calculation:
+//voltage
+E1 = E1*cos(thetae1*%pi/180) + %i*E1*sin(thetae1*%pi/180)
+//Applying Kirchhoff’s voltage law to the primary circuit gives
+//(R1 + R2)*I1 - M*I2 = E1
+//Applying Kirchhoff’s voltage law to the secondary circuit gives
+//-1*M*I1 + ( R3 + R4 + R5)*I2 = 0
+//solving these two
+I2 = E1/((R1 + R2)*(R3 + R4 + R5)/(M) + (-1*M))
+I1 = I2*(R3 + R4 + R5)/(M)
+
+printf("\n\n Result \n\n")
+printf("\n primary current I1 is %.2f +(%.2f)i A",real(I1), imag(I1))
+printf("\n secondary current I2 is %.2f +(%.2f)i A",real(I2), imag(I2))