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The resistance of a bulb filament is 100 ohm at a temperature of 100 degrees centigrade . If it's temperature coefficient of resistance be 0.005 per degree

centigrade , it's resistance will become 200 ohm at a temperature of



Rt= Ro(1+alpha t)

Hence, 100ohm= Ro(1+0.005 x 100)

therefore, Ro= 100/1.5

Now, 200= 100/1.5(1+0.005 x t2)

0.005 x t2= 2

t2= 400 degree centigrade

But by this formula, alpha=(R2-R1)/R1(t2-t1) we have

0.005=200-100/ 100(t2-100)

t2=300 degree centigrade

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