Question

A 0.290-mm-diameter silver wire carries a 40.0 mA current. What is the electric field in the wire? Express your answer with the appropriate units. What is the electron drift speed in the wire? Express your answer with the appropriate units.

Answer 1

E = 0.0096 N/C

Step-by-step explanation:

E = I/σπr²

I = 40 mA = 0.04A

σ silver = 6.29X10⁷ /Ωm

r = 0.29 mm/2 = 0.145 mm = 1.45x10⁻⁴ m

E = 0.04A / (6.29X10⁷ /Ωm)(π)(1.45x10⁻⁴ m)² = 0.0096 N/C

*sorry, don't have time to calculate electron drift velocity for you!