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+//determine critical current density
+//Ex:16.9
+clc;
+clear;
+close;
+ho=65*10^3;//in A/m
+tc=7.18;//in K
+t=4.2;//in K
+r=0.5*10^-3;//in m
+hc=ho*(1-(t/tc)^2);//in A/m
+ic=2*3.14*r*hc;//in A
+a=3.14*r^2;//area in m^2
+j=ic/a;//in A/m^2
+disp(j,"current density (in A/m^2) = "); \ No newline at end of file