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+clc;
+clear all;
+Tc=7.18;//temperature in Kelvin
+H0=6.4*1e4;//critical field in A/m
+d=1e-3;//diameter of wire
+r=d/2;//radius of wire
+T=4.2;//given temperature
+Hc=H0*(1-(T/Tc)^2);//critical field at T=4.2K
+disp('A/m',Hc,'critical field at 4.2K is:')
+Ic=2*%pi*r*Hc;//critical current through wire of lead
+disp('Amp',Ic,'critical current through wire of lead is:')
+//there is slight variation in the answer.. checked in calculator also.. there is mistake of book..