Question

A 1.70 mm cylindrical rod of diameter 0.550 cm is connected to a power supply that maintains a constant potential difference of 13.0 V across its ends, while an ammeter measures the current through it. You observe that at room temperature (20.0 ∘C) the ammeter reads 18.5 A , while at 92.0 ∘C it reads 17.2 A . You can ignore any thermal expansion of the rod

a).Find the resistivity and for the material of the rod at 20 ∘C

b)Find the temperature coefficient of resistivity at 20 ∘C for the material of the rod.

Answer 1