Question

An aluminum wire with a diameter of 0.115 mm has a uniform electric field of 0.235 V/m imposed along its entire length. The temperature of the wire is 45.0°C. Assume one free electron per atom.

(a)

Use the information in this Table of Resistivities and Temperature Coefficients to determine the resistivity (in Ω · m) of aluminum at this temperature.

ρ =  Ω · m

(b)

What is the current density (in MA/m²) in the wire?

J =  MA/m²

(c)

What is the total current (in mA) in the wire?

I =  mA

(d)

What is the drift speed of the conduction electrons?

v_d =  µm/s

(e)

What potential difference must exist between the ends of a 1.50 m length of the wire to produce the stated electric field?

ΔV =  V

Answer 1