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//example-22.3
//page no-660
//given
//critical magnetic field
Hc=7.9*10^3 //A/m
//diameter of aluminium wire
d=1*10^-3 //m
//critical current is give by
Ic=2*(%pi)*d*Hc //A
printf ("the critical current which can pass through a long thin superconducting wire of aluminium is %f A",Ic)
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