An electrical conductor designed to carry large currents has a circular cross-section 2.50 mm in diameter and is 14.0 m long. The resistance between its ends is 0.104Ω .
a. What is the resistivity of the material?
b. If the electric field magnitude in the conductor is 1.28V/m , what is the total current?
c. If the material has 8.5×1028 free electrons per cubic metre, find the average drift speed under the conditions of part (b).