Question
A spool of iron wire 230 m long and with a diameter of 0.480 mm is...
A spool of iron wire 230 m long and with a diameter of 0.480 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 280°C?
W
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