a wire has resistance of 2.5 ohm at 100°C. Temperature coefficient of resistance of the material alpha= 3.6×10^-3 K^-1. Find its resistance at 0°C.
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Answer:
1.84ohm
Explanation:
Let resistance at t°C be R& resistance at 0°C be r
alpha=(R-r)/(r×t)
3.6×10^-3=(2.5-r)/r×100
0.36r=2.5-r
0.36r+r=2.5
1.36r=2.5
r=2.5/1.36=1.84ohm
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