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+clear
+//
+//
+//
+
+//Variable declaration
+H0=64*10**3 //initial field(ampere/m)
+T=5 //temperature(K)
+Tc=7.26 //transition temperature(K)
+
+//Calculation
+H=H0*(1-(T/Tc)**2) //critical field(ampere/m)
+
+//Result
+printf("\n critical field is %0.2f *10**3 ampere/m",H/10**3)