JEE Main 2023PhysicsMagnetic Effects of CurrentHardMCQ

JEE Main 2023 — Magnetic Effects of Current Question with Solution

JEE Main 2023 (30 Jan Shift 2)

Question

As shown in the figure, a current of 2 A flowing in an equilateral triangle of side 43 cm . The magnetic field at the centroid O of the triangle is :

(Neglect the effect of earth’s magnetic field)

Choose an option

Show full solutionCorrect option: D
Correct answer
D33×10-5 T

Step-by-step explanation

Perpendicular distance of centroid from any of the sides will be, dtan60°=23

⇒d=2 cm

Each side will subtend an angle of 120° at the centre. Also magnetic field due to all sides will be out of plane of paper, hence total magnetic field can be written as

B=3×μ0i4πdsin60°+sin60°

=3×10-7×22×10-2×3

=33×10-5 T

Practice this on the real CBT interface

Solve this JEE Main question (and the rest of the Magnetic Effects of Current 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 2023, covering the Magnetic Effects of Current 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.