CBSE Class 12-science Answered
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 | 22 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 | 22 Sep, 2010, 10:21: PM
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