Copper and aluminum are being considered for a high-voltage transmission line that must carry a current of 80.0 A. The resistance per unit length is to be 0.125 ohm/km. The densities of copper and aluminum are 8960 and 2700 kg/m3, respectively. An alloy specially designed Compute: the magnitude J of the average current density for a copper cable A/m2 the mass per unit length A for a copper cable. kg/m the magnitude J of the average current density for an aluminum cable A/m2 the mass per unit length A for an aluminum cable, kg/m
