Physics, 05.06.2021 14:00, PastyMexican24

The temperature coefficient of resistivity of iron is 5 × 10-3 /°C; that of carbon is -0.5 × 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:

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The temperature coefficient of resistivity of iron is 5 × 10-3 /°C; that of carbon is -0.5 × 10-3 /°...