Question

Tipler6 25.P.033.soln.

A 10-gauge copper wire and a 14-gauge copper wire are welded together end to end. The wires carry a current of 15.8 A.

(a) If there is one free electron per copper atom in each wire, find the drift velocity of the electrons in each wire. (Let the cross-sectional area of 10-gauge and 14-gauge wire be 5.261 mm² and 2.081 mm², respectively.)

10 - Gauge Wire _________ mm/s

14 - Gauge Wire _________ mm/s

(b) What is the ratio of the magnitude of the current density in the length of 10-gauge wire to the magnitude of the current density in the length of 14-gauge wire?

J10 / J14 =

Answer 1