JEE Main 2021 — Electrostatics Question with Solution
From: JEE Main 2021 (Online) 20th July Morning Shift
Question
A certain charge Q is divided into two parts q and (Q q). How should the charges Q and q be divided so that q and (Q q) placed at a certain distance apart experience maximum electrostatic repulsion?
Choose an option
Show full solutionCorrect option: A
Correct answer
AQ = 2q
Step-by-step explanation
Let's say the charge q and (Q q) are at r distance from each other. This can be shown as
According to Coulomb's law, force between both the parts can be given as
As we know that , for maximum force.
According to Coulomb's law, force between both the parts can be given as
As we know that , for maximum force.
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This is a previous-year question from JEE Main 2021, covering the Electrostatics 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.