Answered: The thermal coefficient of resistivity…

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter27: Current And Resistance

Section: Chapter Questions

Problem 27.81AP: The potential difference across the filament of a light-bulb is maintained at a constant value while...

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The thermal coefficient of resistivity of iron is alpha = 5.0 x 10 ^ (- 3 / ° C), that of carbon is alpha = - 0.50 x 10 ^ (- 3 / ° C) When an iron wire and a carbon bar , both with a resistance of 10 Ω at 20 ° C, cool down to a temperature of -80 ° C, the new relationship between the resistance of the carbon rod and that of the iron wire at the lowest temperature is

a.
+1.9

b.
-0.10

c.
-10

d.
+2.1

e.
+10

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