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+//CHAPTER 8- DIRECT CURRENT MACHINES
+//Example 9
+
+disp("CHAPTER 8");
+disp("EXAMPLE 9");
+
+//VARIABLE INITIALIZATION
+P=4;                      //number of poles
+v_t=230;                  //in Volts
+I_l=52;                   //in Amperes
+Z=600;                    //tottal number of conductors
+r_f=115;                  //in Ohms
+d=30/100;                 //airgap diameter from cm to m
+l=20/100;                 //effective length of pole
+B=4100/10000;             //flux density from Gauss to Wb/m^2
+
+//SOLUTION
+I_f=v_t/r_f;              //I_f is same as I_sh 
+I_a=I_l-I_f;
+ar=(%pi*d*l)/P;           //area of pole
+phi=ar*B;                 //phi = flux
+A=P;
+T=(phi*Z*I_a)/(2*%pi*A);
+disp(sprintf("The torque developed in the motor is %f N-m",T));
+
+//The answer is different as 'A' has not been included in the denominator(in the book)
+
+//END
+