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electric-redLv1
16 Mar 2021
A spool of copper wire 290 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. 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 0.450 A? V/m (b) What is the electric power in W) delivered to the spool while it carries a current of 0.450 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 copper wire 290 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. 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 0.450 A? V/m (b) What is the electric power in W) delivered to the spool while it carries a current of 0.450 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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