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The resistances of an iron wire and a co...

The resistances of an iron wire and a copper wire at `20^(@)C`are `3.9(Omega)`and `4.1(Omega)`respectively. At what temperature will the resistances be equal?Temperature coefficient of resistivity for iron is `5.0xx10^(-3)K^(-1)`and for copper it is `4.0xx10^(-3)k^(-1).`Neglect any thermal expansion.

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`84.5^(@)C`
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