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+//Example number 3.10, Page number 3.35
+
+
+clc;clear;close
+
+// Variable declaration
+H0=6.5*10**4 // (ampere/metre)
+T=4.2 // K
+Tc=7.18 // K
+r=0.5*10**-3
+
+// Calculations
+Hc=H0*(1-(T/Tc)**2) // unitless
+Ic=(2*%pi*r)*Hc // A
+A=%pi*r**2 // m^2
+Jc=Ic/A // Critical current density
+
+// Result
+printf("Hc = %0.4e",Hc)
+printf("\nCritical current density,Jc = %0.2e ampere/metre^2",Jc)