CBSE Class 12-science Answered
What is the percentage change in the resistance of german-silver wire when its temperature changes from 25 degree celsius to 50 degree celsius , 
per degree celsius
per degree celsius
Asked by Shashank | 15 Nov, 2014, 07:29: PM
Expert Answer
We know that resistance of pure metals increases with rise in temperature.Let R0 be the initial resistance at T0 = 25°C and R be the resistance at T =50° C
Let α be the temperature coefficient of resistance and =0.0004 /°C
We know that R = R0 [1 + α (T - T0) ]
Change in temperature, ΔT = 50°C - 25°C =25 °C
Answered by Jyothi Nair | 15 Nov, 2014, 08:37: PM
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