A piece of platinum wire has resistance 2.5 Ω and 3 Ω at 0⁰ C and 80⁰ C respectively, the temperature coefficient of resistance is_______ *.
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Explanation:
R
28
o
c
=2.5
R
100
o
c
=2.9
ΔR=αθR
28
o
c
2.9−2.5=α×(100−28)×2.5
α=2.22×10
−3
°C
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