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The resistances of an iron wire and a copper wire at 20 ∘ are 3.9 Ω and 4.1 Ω respectively. At what temperature will the resistances be equal ? Temperature coefficient of resistivity for iron is 5.0 ×−3K−1 and for copper it is 4.0 ×10−3K−1. Neglect any thermal expansion. |
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Answer» The resistances of an iron wire and a copper wire at 20 ∘ are 3.9 Ω and 4.1 Ω respectively. At what temperature will the resistances be equal ? Temperature coefficient of resistivity for iron is 5.0 ×−3K−1 and for copper it is 4.0 ×10−3K−1. Neglect any thermal expansion. |
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