A 1.70mcylindrical rod of diameter 0.550cmis connected to a power supply that maintains a constant potential difference of 13.0Vacross its ends, while an ammeter measures the current through it. You observe that at room temperature (20.0C) the ammeter reads 18.8A, while at 92.0Cit reads 17.3A. You can ignore any thermal expansion of the rod.
A) Find the resistivity and for the material of the rod at 20 C. (Answer in Omega*m)
B) Find the temperature coefficient of resistivity at 20 Cfor the material of the rod. (Answer in Degrees Celcius^-1)