The Temperature Coefficient of Resistivity of Iron Is 5 $\degree$ C;that of Carbon Is-0

The temperature coefficient of resistivity of iron is 5.0 *10 ^{- 3} / $\degree$ C;that of carbon is-0.50 *10 ^{- 3} / $\degree$ C.When an iron wire and a carbon rod,each having the same 10 $\Omega$ resistance at 20 $\degree$ C,are cooled from that temperature to -80 $\degree$ C,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.

Correct Answer:

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