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+clc();
+clear;
+// To calculate the permeability
+H=1800; //magnetising field in amp/m
+phi=3*10^-5; //magnetic flux in weber
+A=0.2; //cross sectional area in cm^2
+A=A*10^-4; //cross sectional area in m^2
+B=phi/A;
+mew=B/H;
+printf("the permeability is %f Henry/m",mew);
+
+//answer given in the book is wrong