Answer to Question #64540 in Electric Circuits for Jay transfiguracion jr

Question

A copper conductor with square cross-section,1.0mm on a side,carries a constant current of 15A to a 3hp electric motor. The density of the free electrons is 8x10^28 electrons per cubic meter.find (a) current density (b) drift speed (c) electric field (d) the potential difference between 100m apart. (e) the resistance of a100m length of this copper conductor (f) suppose the resistance at (e) is at temperature 25 degrees celcius,find the resistance at 0 degrees celcuis and 100 deg.celcuis.