A spool of iron wire 290 m long and with a diameter of 0.480 mm is at 20.0°C. For iron, the resistivity is 10.0 ✕ 10−8 ��� · m and the temperature coefficient of resistivity is 5.00 ✕ 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 0.450 A? (b) What is the electric power (in W) delivered to the spool while it carries a current of 0.450 A? (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 400°C?
A spool of iron wire 290 m long and with a diameter of 0.480 mm is at 20.0°C. For iron, the resistivity is 10.0 ✕ 10−8 ��� · m and the temperature coefficient of resistivity is 5.00 ✕ 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 0.450 A? (b) What is the electric power (in W) delivered to the spool while it carries a current of 0.450 A? (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 400°C?
Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter21: Current And Direct Current Circuits
Section: Chapter Questions
Problem 61P
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A spool of iron wire 290 m long and with a diameter of 0.480 mm is at 20.0°C. For iron, the resistivity is 10.0 ✕ 10−8 ��� · m and the temperature coefficient of resistivity is 5.00 ✕ 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 0.450 A?
(b)
What is the electric power (in W) delivered to the spool while it carries a current of 0.450 A?
(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 400°C?
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