JEE Main 2019PhysicsElectrostaticsMediumMCQ

JEE Main 2019 — Electrostatics Question with Solution

JEE Main 2019 (09 Apr Shift 1)

Question

A system of three charges are placed as shown in the figure:

If D >> d, the potential energy of the system is best given by:

Choose an option

Show full solutionCorrect option: A
Correct answer
A14πϵ0-q2d-q Q dD2

Step-by-step explanation

U=k-qqd+k-qQd2-D+kqQD+d2
=-kq2d-kQqD-d2+KQqD+d2
=-kq2d+kQq-D-d2+ D-d2D2-d24
=-kq2d-kQqdD2-d24
Since, D>>d
U=-kq2d-kQqdD2=14πϵ0-q2d-q Q dD2

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About this question

This is a previous-year question from JEE Main 2019, 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.