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+//Find the number of ampere turns
+
+clc;
+clear;
+
+l=30*(10^-2); // Length of an iron path
+lag=2*(10^-3);//Length of air gap
+B=0.8; // Flux density
+H=700;
+m0=(4*%pi)*(10^-7);
+mr=B/(m0*H);
+
+A=poly(0,'A');//Area of the iron path
+
+R1=l/(m0*mr*A);
+R2=lag/(m0*A);
+R=R1+R2;
+
+phi=B*A;//Flux
+
+NI=phi*R;
+
+//To find numerical value
+y=NI-A;
+
+NI=roots(y(2));
+
+//The answer in the textbook contains Round off error
+printf('The number of turns necessary to produce a flux density of 0.8T in the air gap = %g AT\n',NI)