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23 Nov 2019
A 1.50-m cylindrical rod of diameter 0.500 cm is connected to a power supply that maintains a constant potential difference of 15.0V across its ends, while an ammeter measures the current through it. You observe that at room temperature (20.0C) the ammeter reads 18.5A, while at 92.0C it reads 17.2A. You can ignore any thermal expansion of the rod. Find (a) the resistivity and (b) the temperature coefficient of resistivity at 20C for the material of the rod.
A 1.50-m cylindrical rod of diameter 0.500 cm is connected to a power supply that maintains a constant potential difference of 15.0V across its ends, while an ammeter measures the current through it. You observe that at room temperature (20.0C) the ammeter reads 18.5A, while at 92.0C it reads 17.2A. You can ignore any thermal expansion of the rod. Find (a) the resistivity and (b) the temperature coefficient of resistivity at 20C for the material of the rod.
