Question

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.​

Answer 1

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