Question

15. A spool of aluminum wire 290 m long and with a diameter of 0.440 mm is at 20.0°C. For aluminum, the resistivity is 2.82 ✕ 10⁻⁸ Ω · m and the temperature coefficient of resistivity is 3.90 ✕ 10⁻³ (°C)⁻¹.

(a)

What is the magnitude of the electric field (in V/m) in the wire if it carries a current of 0.600 A?

V/m

(b)

What is the electric power (in W) delivered to the spool while it carries a current of 0.600 A?

W

(c)

What is the power (in W) delivered to the spool if the potential difference across the wire is held constant and the temperature is increased to 370°C?

W

Answer 1