JEE Main 2022 — Current Electricity Question with Solution
From: JEE Main 2022 (Online) 28th July Morning Shift
Question
A wire of resistance R1 is drawn out so that its length is increased by twice of its original length. The ratio of new resistance to original resistance is :
Choose an option
Show full solutionCorrect option: A
Correct answer
A9 : 1
Step-by-step explanation
Length is increased by twice of its original length.
So, if original length is then final length is = + 2 = 3.
Then area becomes, A2 =
So, if original length is then final length is = + 2 = 3.
Then area becomes, A2 =
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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.