A 1.60 m cylindrical rod of diameter 0.450 c m is connected to a power supply th

Question

A 1.60m cylindrical rod of diameter 0.450cm 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 (20.0 ?C) the ammeter reads 18.5A , while at 92.0 ?C it reads 17.3A . 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 ?C for the material of the rod.

Explanation / Answer

hence resistivity will be 12.16x10^-5

thermal expansionis ignored. the change in resistance is due to change in resistivity when temperature is increased.

temperature coefficient of resistivity is 9.651x10^-4

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