A spool of copper wire 290 m long and with a diameter of 0.440 mm is at 20.0°C. For copper, the resistivity is 1.70 x 10 8 .m and the temperature coefficient of resistivity is 3.90 x 10- (°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 400°C? W

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A spool of copper wire 290 m long and with a diameter of 0.440 mm is at 20.0°C. For copper, the resistivity is
1.70 x 10 8 .m and the temperature coefficient of resistivity is 3.90 x 10- (°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 400°C?
W
Transcribed Image Text:A spool of copper wire 290 m long and with a diameter of 0.440 mm is at 20.0°C. For copper, the resistivity is 1.70 x 10 8 .m and the temperature coefficient of resistivity is 3.90 x 10- (°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 400°C? W
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