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//chapter19
//example19.12
//page424
It=8.93 // A
Ic=8 // A
// we know that (It/Ic)^2=1+m^2/2 so making m as subject we get
m=(2*((It/Ic)^2-1))^0.5
printf("modulation factor = %.3f or %.3f percent \n",m,m*100)
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