A nichrome wire and an aluminum wire, each with the same initial resistance, have the same change in resistance when heated separately. (Al = 2.82 108 / m; Al = 3.9 103 / C; nichrome = 1.50 106 / m; nichrome = 0.40 103 / C.) The ratio of the temperature change of the nichrome wire to the temperature change of the aluminum wire is
a. 0.019.
b. 0.10.
c. 0.18.
d. 9.8.
e. 53.
Question 2
The temperature coefficient of resistivity of iron is 5.0 103 / C; that of carbon is 0.50 103 / C. When an iron wire and a carbon rod, each having the same 10 resistance at 20C, are cooled from that temperature to 80C, the new ratio of the resistance of the carbon rod to the resistance of the iron wire at the lower temperature is
a. 0.10.
b. +1.9.
c. +2.1.
d. 10.
e. +10.
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