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Answer 1

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Explain what is meant by the temperature coefficient of resistance of a material. A copper rod, 0.4 m long and 4.0 mm in diameter, has a resistance of 550 µΩ at 20 °C. Calculate the resistivity of copper at that temperature. If the rod is drawn out into a wire having a uniform diameter of 0.8 mm, calculate the resistance of the wire when its temperature is 60 °C. Assume the resistivity to be unchanged and the temperature coefficient of resistance of copper to be 0.004 26/°C.