JEE Main 2022 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 27 July 2022, Shift 1, Physics Q42

Question 42 of 90 in this shift, Physics question 12 of 30, Section A.

Two bar magnets oscillate in a horizontal plane in earth's magnetic field with time periods of 3s and 4s respectively. If their moments of inertia are in the ratio of 3:2, then the ratio of their magnetic moments will be:

(1)2:1
(2)8:3Official answer
(3)1:3
(4)27:16

Official answer

Option 2

NTA final key.

Chapter: Magnetism and Matter
Topic: Magnetic Dipole Moment
Idea tested: Comparing Moments via Vibration Magnetometer

Same topic in other shifts

All Magnetic Dipole Moment questions

4 Apr 2026, Shift 1 · Q41An insulated wire is wound so that it forms a flat coil with $N=200$ turns. The radius of the innermost turn is $r_1=3$ cm, and of the…MediumSingle correct
4 Apr 2026, Shift 2 · Q48Two identical small bar magnets each of dipole moment $3\sqrt5$ J/T are placed at a center to center separation of 10 cm, with their axes…MediumNumerical valueHas a figure
4 Apr 2026, Shift 2 · Q49A circular coil of radius 2 cm and 125 turns carries a current of 1 A. The coil is placed in a uniform magnetic field of magnitude 0.4 T.…EasyNumerical value
8 Apr 2026, Shift 2 · Q39A current carrying circular loop of radius 2 cm with unit normal $\hat{n} = \frac{\hat{k} + \hat{i}}{\sqrt{2}}$ is placed in a magnetic…MediumSingle correct
3 Apr 2025, Shift 2 · Q36A magnetic dipole experiences a torque of $80\sqrt{3}$ N m when placed in uniform magnetic field in such a way that dipole moment makes…EasySingle correct
4 Apr 2024, Shift 1 · Q57The magnetic field existing in a region is given by $\vec{B} = 0.2\,(1 + 2x)\hat{k}\,\mathrm{T}$ . A square loop of edge 50 cm carrying 0.5…HardNumerical valueHas a figure

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.