JEE Main 2022 · PhysicsMultiple choiceSingle correctEasyRecall

JEE Main 25 July 2022, Shift 1, Physics Q49

Question 49 of 90 in this shift, Physics question 19 of 30, Section A.

The magnetic moment of an electron (e) revolving in an orbit around nucleus with an orbital angular momentum is given by :

(1) $\vec\mu_L=\frac{e\vec L}{2m}$
(2) $\vec\mu_L=-\frac{e\vec L}{2m}$ Official answer
(3) $\vec\mu_l=-\frac{e\vec L}{m}$
(4) $\vec\mu_l=\frac{2e\vec L}{m}$

Official answer

Option 2

NTA final key (2022 Session 2).

Chapter: Magnetism and Matter
Topic: Magnetic Dipole Moment
Idea tested: Gyromagnetic ratio and Bohr magneton

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
6 Apr 2024, Shift 2 · Q58A coil having 100 turns, area of $5\times10^{-3}\ \mathrm{m^2}$ , carrying current of 1 mA is placed in uniform magnetic field of 0.20 T…EasyNumerical value

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 42 of the 174 JEE Main shifts held from 2017 to 2026.