JEE Main 2019PhysicsElectrostaticsHardMCQ

JEE Main 2019 — Electrostatics Question with Solution

JEE Main 2019 (08 Apr Shift 2)

Question

A positive point charge is released from rest at a distance r0 from a positive line charge with uniform charge density. The speed (v) of the point charge, as a function of instantaneous distance r from line charge, is proportional to

Choose an option

Show full solutionCorrect option: B
Correct answer
Bv∝ln⁡rr0

Step-by-step explanation

12mv2=q∆V
12mv2=q×λ2πε0ln⁡rr0
v2=qλmπε0ln⁡rr0
v=qλmπε0ln⁡rr0

v∝ln⁡rr0

 

Practice this on the real CBT interface

Solve this JEE Main question (and the rest of the Electrostatics chapter) on PrepSharp's TCS iON-style CBT player — with timer, bookmarks and session analytics.

Solve interactively →

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.