Answer to Question #290624 in Mechanical Engineering for Momi

Question

(1)Find the total charge and the current flowing in a cylindrical conductor (solid wire)of length 1m

and radius 1mm, given that the density of the charge, n = 1029 carriers/m3

, and the charge carrier

velocity, u = 19.9

10-6 m/s.

Answer 1

$I=\frac{\Delta Q}{\Delta t}$

If a current passes through any conductor, net charge through any section is zero. hence, electric field in the vicinity of the conductor is zero. We can observe using Biot and Savart law that the magnetic field at the axis of the cylindrical wire will be zero. Electric field at the axis of the wire cannot be zero otherwise the current through the wire cannot flow.