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//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)
Ic=(2*%pi*r)*Hc
A=%pi*r**2
Jc=Ic/A //Critical current density
//Result
printf('Hc = %0.3f *10**4 \n',(Hc/10**4))
printf('Critical current density,Jc = %0.3f *10**8 ampere/metre**2 \n',(Jc/10**8))
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