A copper wire has a square cross section 2.5 mm on a side. The wire is 3.2 m long and carries a current of 4.6 A. The density of free electrons is 8.5 1028/m3.
(a) Find the magnitude of the current density in the wire.
A/m2
(b) Find the magnitude of the electric field.
V/m
(c) How much time is required for an electron to travel the length of the wire?
s