An 80-cm-long wire is made by welding a 12 mm-diameter
An 80-cm-long wire is made by welding a 1.2 mm-diameter, 20-cm-long copper wire to a1.2 mm-diameter, 60-cm-long iron wire. What is theresistance of the composite wire?
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an 80-cm-long wire is made by welding a 12 mm-diameter 20-cm-long copper wire to a12 mm-diameter 60-cm-long iron wire
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