The figure below shows wire section 1 of diameter D1=4.00R and wire section 2 of diameter D2=2.00R connected by a tapered section. The wire is copper and carries a current. Assume the current is uniformly distributed across any cross-sectional area through the wire's width. The electric potential charge V along the length L=1.84m shown in section 2 is 14.0V. The number of charge carriers per unit volume is 8.49 x 1028 m-3. What is the drift speed of the conduction electrons in section 1?
https://www.webassign.net/hrw10/26-p-034.gif