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+//Example_a_10_18 page no:479
+clc;
+l=0.6;
+r=l/(2*%pi);
+N=300;
+I=1;
+AT=300;
+a=%pi*r^2;
+mu=4*%pi*10^-7
+R=l/(mu*N*a);
+lg=90.345/299;
+disp(lg,"the air gap is (in m)");
+disp(R,"the reluctance is (in AT/wb)");
+//reluctance value varies in the textbook hence area and radius is rounded off in text book