JEE Main 2017PhysicsMagnetic Effects of CurrentMediumMCQ

JEE Main 2017 — Magnetic Effects of Current Question with Solution

JEE Main 2017 (09 Apr Online)

Question

A uniform magnetic field B of 0.3T is along the positive Z -direction. A rectangular loop (abcd) of sides 10 cm×5 cm carries a current I of 12 A. Out of the following different orientations which one corresponds to stable equilibrium?

Choose an option

Show full solutionCorrect option: C
Correct answer
C

Step-by-step explanation

U=-M→·B→=-MBcosθ

For stable equilibrium potential energy should be minimum and τ=0

Umin=-MB    when θ=0°

⇒cos⁡θ = 1

⇒M→ and B→  are on same direction.

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About this question

This is a previous-year question from JEE Main 2017, 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.