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+//Flux density, field intensity and permeability
+//Example 6.3(pg 213)
+clc
+clear
+l=0.4//mean circumference in m
+N=200//tunrs
+Uo=4*%pi*(10^-7)//permeability of free space in H/m
+a=5*(10^-4)// cross section area in m^2
+I=6.4//current in Amp
+f=0.8*(10^-3)//flux in Wb
+fd=f/a//flux density in Wb/m^2
+fi=I*N/l//Field intensity in AT/m
+Ur=(f*l)/(N*I*Uo*a)//relative permeability
+printf('(i) The Flux density is %3.2f Wb/m^2 \n',fd)
+printf('(ii) The Field intensity is %3.2f AT/m \n',fi)
+printf('(iii) The Relative permeability of steel is %3.2f ',Ur)
+//The answer to part(iii) has a calculation error in the textbook, hence it doesn't match the answer here.