JEE Main 2021 — Electrostatics Question with Solution
From: JEE Main 2021 (Online) 27th August Morning Shift
Question
A uniformly charged disc of radius R having surface charge density is placed in the xy plane with its center at the origin. Find the electric field intensity along the z-axis at a distance Z from origin :-
Choose an option
Show full solutionCorrect option: A
Correct answer
A
Step-by-step explanation
Consider a small ring of radius r and thickness dr on disc.
area of elemental ring on disc
dA = 2rdr
charge on this ring dq = dA
area of elemental ring on disc
dA = 2rdr
charge on this ring dq = dA
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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.