The Temperature Coefficient of Resistivity of Iron Is 5

question 16

Multiple Choice

The temperature coefficient of resistivity of iron is 5.0 × 10⁻³ / °C; that of carbon is −0.50 × 10⁻³ / °C. When an iron wire and a carbon rod, each having the same 10-Ω resistance at 20°C, are cooled from that temperature to −80°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.

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