JEE Main 2021 — Current Electricity Question with Solution
From: JEE Main 2021 (Online) 26th August Morning Shift
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 ?
(Given resistivities of iron and copper-nickel alloy wire are 12 and 51 cm respectively)
(Given resistivities of iron and copper-nickel alloy wire are 12 and 51 cm respectively)
Choose an option
Show full solutionCorrect option: B
Correct answer
B97 m
Step-by-step explanation
= 3
l = 97 m
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This is a previous-year question from JEE Main 2021, covering the Current Electricity chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.