Acopper wire has a square cross section 2.3 mm on a side. the wire is 4.0 m long and carries a current of 3.0 a. the density of free electrons is 8.5 x 1028 m3
part a find the magnitude of the current density in the wire. express your answer using two significant figures. vaxd a/m2 j request answer submit part b find the magnitude of the electric field in the wire. express your answer using two significant figures. vaxo ? v/ e= submit request answer part c how much time is required for an electron to travel the length of the wire? express your answer using two significant figures