Question

The resistance of a platinum wire at 100°C is 3.5Ω. Find the resistance of the wire at 0°C. Given, temperature coefficient of resistance is 0.004?​

Answer 1

Answer:

Given,

RT=4.2ohm

T=1000C

α=0.004/0C

T0=00C

ΔT=T−T0=100−0=1000C

The resistance, RT=R0(1+αΔT)

R0=(1+αΔT)RT

R0=(1+0.004×100)4.2=3Ω

Explanation:

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