What equal length of an iron wire and a copper-nickel alloy wire, each of 2 mm diameter connected parallel to give an equivalent resistance of \(3\Omega\) ? (Given resistivities of iron and copper-nickel alloy wire are \(12\mu \Omega cm\) and \(51\mu \Omega cm\) respectively)

[JEE Main 2021, 26 Aug (Shift 1)]

Question

What equal length of an iron wire and a copper-nickel alloy wire, each of 2 mm diameter connected parallel to give an equivalent resistance of \(3\Omega\) ? (Given resistivities of iron and copper-nickel alloy wire are \(12\mu \Omega cm\) and \(51\mu \Omega cm\) respectively)

[JEE Main 2021, 26 Aug (Shift 1)]

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