A spool of aluminum wire 200 m long and with a diameter of 0.360 mm is at 20.0°C. For aluminum, the resistivity is 2.82 x 10-80 m and the temperature coefficient of resistivity is 3.90 x 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 0.400 A? V/m (b) What is the electric power (in W) delivered to the spool while it carries a current of 0.400 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 310°C? W

A spool of aluminum wire 200 m long and with a diameter of 0.360 mm is at 20.0°C. For aluminum, the resistivity is 2.82 x 10-80 m and the temperature coefficient of resistivity is 3.90 x 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 0.400 A? V/m (b) What is the electric power (in W) delivered to the spool while it carries a current of 0.400 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 310°C? W

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter17: Current And Resistance

Section: Chapter Questions

Problem 66AP: When a straight wire is heated, its resistance changes according to the equation R = R0 [1 + (T ...

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Concept explainers

Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.

Question

-8
A spool of aluminum wire 200 m long and with a diameter of 0.360 mm is at 20.0°C. For aluminum, the resistivity is 2.82 x 107 Ω·
• m and the temperature coefficient of resistivity is
3.90 x 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 0.400 A?
V/m
(b) What is the electric power (in W) delivered to the spool while it carries a current of 0.400 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 310°C?
W

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A spool of copper wire 320 m long and with a diameter of 0.360 mm is at 20.0°C. For copper, the resistivity is 1.70 x 10-8 0. m and the temperature coefficient of resistivity is 3.90 x 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 0.550 A? V/m (b) What is the electric power (in W) delivered to the spool while it carries a current of 0.550 A? W
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