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//example-22.2
//page no-660
//given
//critical temp of Pb
T0=7.17 //K
//critical field
H0=0.0803 //A/m
//to find the critical field at
T1=3 //K
T2=10 //K
//critical field at T1
Hc1=H0*(1-T1^2/T0^2) //A/m
//critical field at T2
Hc2=H0*(1-T2^2/T0^2) //A/m
printf ("the critical field at 3K temp is %f A/m and at 10K ia %f A/m",Hc1,Hc2)
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