A copper wire has a circular cross-section with a radius of1.25 mm. (a) If the wire carries a current of 3.70 A, findthe drift speed of electrons in the wire. (Take the density ofmobile charge carriers in copper to be  n= 1.10 x 1029 electrons/m3.) (b) For the same wire size and current, find thedrift speed of electrons if the wire is made of aluminum withn= 2.11 x 1029 electrons/m3.

A copper wire has a circular cross-section with a radius of
1.25 mm. (a) If the wire carries a current of 3.70 A, find
the drift speed of electrons in the wire. (Take the density of
mobile charge carriers in copper to be  n= 1.10 x 10²⁹ electrons/
m³.) (b) For the same wire size and current, find the
drift speed of electrons if the wire is made of aluminum with
n= 2.11 x 10²⁹ electrons/m³.