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//example-18.5
//page no-548
//given
//resistance of wire at 70 degree celcius is 57.2 ohm and at 25 degrees celcius 50 ohm
R25=50 //ohm
R70=57.2 //ohm
T1=25 //degree C
T2=70 //degree C\
//as we know that
//Rt=R0*(1+t*alpha)
//putting above values in the above given equation we get
//R25=R0*(1+25*alpha) -------(1)
//R70=R0*(1+70*alpha) --------(2)
//applying R70/R25
//we get
//R70/R25=(1+70*alpha)/(1+25*alpha)
//solving for alpha we get equation as follows
alpha=(R70-R25)/(T2*R25-T1*R70) //K^-1
printf ("the temperature coefficient of resistance is %f K^-1",alpha)
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