A spool of iron wire 320 m long and with a diameter of 0.360 mm is at 20.0°C. For iron, the resistivity is 10.0 ✕ 10−8 Ω · 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 0.550 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 (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 iron wire 320 m long and with a diameter of 0.360 mm is at 20.0°C. For iron, the resistivity is 10.0 ✕ 10−8 Ω · 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 0.550 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 (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

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter28: Current And Resistance

Section: Chapter Questions

Problem 65PQ

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