Solved: Two wires have the same cross-sectional area and
Chapter 20, Problem 20.82(choose chapter or problem)
Two wires have the same cross-sectional area and are joined end to end to form a single wire. One is tungsten, which has a temperature coefficient of resistivity of 0.0045 (C ) 1 . The other is carbon, for which 0.0005 (C ) 1 . The total resistance of the composite wire is the sum of the resistances of the pieces. The total resistance of the composite does not change with temperature. What is the ratio of the lengths of the tungsten and carbon sections? Ignore any changes in length due to thermal expansion. * 2
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