JEE Main 2023 — Current Electricity Question with Solution
From: JEE Main 2023 (Online) 24th January Evening Shift
Question
If a copper wire is stretched to increase its length by 20%. The percentage increase in resistance of the wire is __________%.
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Show full solutionCorrect answer: 44
Correct answer
44
Step-by-step explanation
Let be its initial length and be initial area.
Considering volume to be conserved
Hence increase
Considering volume to be conserved
Hence increase
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This is a previous-year question from JEE Main 2023, 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.