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What equal length of an iron wire and a copper-nickel alloy wire each of 2 mm diameter

Q. 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 3Ω?
(Given the resistivities of iron and copper-nickel alloy wire is 12 μΩ cm and 51 μΩ cm respectively)

(1) 82 m

(2) 97 m

(3) 110 m

(4) 90 m                    (JEE-2021)

Aditya Bhatt Answered question 30 January 2024
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