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A platinum wire is 5 ohm at the ice point and 5.23 ohm at the steam point. What is its temperature coefficient?
A4.6 x 10^-4 per deg C
B2.3 x 10^-3 per deg C
C4.6 x 10^-3 per deg C
D2.3 x 10^-4 per deg C
Answer & Solution
Correct answer: A. 4.6 x 10^-4 per deg C
alpha = (5.23 - 5)/(5 x 100) = 4.6 x 10^-4 per degree Celsius.
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