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August 2, 2014

Homework Help: physics

Posted by Anonymous on Monday, February 25, 2013 at 5:24pm.

A portable electric heater uses 23.8 A of current. The manufacturer recommends that an extension cord attached to the heater receive no more than 2.60 W of power per meter of length. What is the smallest radius of copper (resistivity 1.72 x 10-8 Ωm) wire that can be used in the extension cord? (Note: An extension cord contains two wires.)

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