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00-gauge copper wire has a diameter of 9.266 mm and a
resistivity of 1.68 × 10−8 Ω · m at 20.0◦C. The wire is 1.00m in
length.
a) What is the power loss in the wire if the wire carries 110.
A?
b) The temperature coefficient of resistivity for copper is α = 3.90 × 10−3 ◦C−1. If the copper is at 40.0◦C, what is its new resistivity?
c) If it still has the same power loss, what is the current it carries at 40.0◦C?
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