JEE Main 2019 — Electrostatics Question with Solution
From: JEE Main 2019 (Online) 9th January Evening Slot
Question
Charge is distributed within a sphere of radius R with a volume charge density where A and a are constants. If Q is the total charge of this charge distribution, the radius R is :
Choose an option
Show full solutionCorrect option: B
Correct answer
B log
Step-by-step explanation
Volume of this spherical layer,
dv = (4r2)dr
charge present in this layer,
dq = (4r2 dr)
=
=
Total charge in the sphere,
Q=
= 4A
= 4A
= 4A
Q = 2aA
=
= 1
=
R = log
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.