JEE Main 2021 — Current Electricity Question with Solution
From: JEE Main 2021 (Online) 18th March Evening Shift
Question
Two wires of same length and thickness having specific resistances 6 cm and 3 cm respectively are connected in parallel. The effective resistivity is cm. The value of , to the nearest integer, is ____________.
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Show full solutionCorrect answer: 4
Correct answer
4
Step-by-step explanation
Let length of each wire is l and area A. When they are connected in parallel then their effective area 2A.
From formula we know,
From formula we know,
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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.