JEE Main 2022 — Current Electricity Question with Solution
From: JEE Main 2022 (Online) 25th June Evening Shift
Question
The length of a given cylindrical wire is increased to double of its original length. The percentage increase in the resistance of the wire will be ____________ %.
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Show full solutionCorrect answer: 300
Step-by-step explanation
Volume is constant so on length doubled
Area is halved so
and
So percentage increase will be
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This is a previous-year question from JEE Main 2022, 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.