TEMPERATURE COEFFICIENT OF RESISTANCE OF A WIRE IS 0.00125 DEGREE PER CENTIGRADE. AT 300K ITS RESISTANCE IS ONE OHM.FIND TEMPERATURE AT WHICH RESISTANCE WILL BE 2 OHM?

Asked by mishita goel | 22nd Sep, 2010, 05:58: PM

Expert Answer:

Let the temperature at which the resistance is 2 ohms is T.
 
Now, at 300K , resistance is 1 ohm it is given.
 
So, the temperature difference will be T-300
 
therefore, 2=1(1+0.00125*(T-300))
 
so, 2 = 1 + 0.00125T - 0.375
so, 1.375 = 0,00125 T
hence T = 1.375/0.00125 - 1100 Kelvin

Answered by  | 22nd Sep, 2010, 10:21: PM

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