Problem

Problem

The resistance of a copper wire and an iron wire at 20∘C20^\circ\text{C} are 4.1 Ω4.1\ \Omega and 3.9 Ω3.9\ \Omega , respectively. Neglecting any thermal expansion, find the temperature at which resistances of both are equal. αCu=4.0×10−3 K−1 and αFe=5.0×10−3 K−1.\alpha_{\text{Cu}} = 4.0 \times 10^{-3}\ \text{K}^{-1} \text{ and } \alpha_{\text{Fe}} = 5.0 \times 10^{-3}\ \text{K}^{-1}.

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