19.15. A 1.40 m cylindrical rod of diameter 0.450 cm is connected to a power sup

Question

19.15. A 1.40 m cylindrical rod of diameter 0.450 cm is connected to a power supply that maintains a constant potential difference of 16.0 V across its ends, while an ammeter measures the current through it. You observe that at room temperature (20.0 C ) the ammeter reads 18.8 A, while at 92.0 C it reads 17.1 A . You can ignore any thermal expansion of the rod. Find the resistivity and for the material of the rod at 20 C Find the temperature coefficient of resistivity at 20 for the material of the rod.

Explanation / Answer

Ohm

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