JEE Main 2020 · PhysicsMultiple choiceSingle correctMediumMulti-step

JEE Main 6 September 2020, Shift 2, Physics Q14

Question 14 of 75 in this shift, Physics question 14 of 25.

A charged particle going around in a circle can be considered to be a current loop. A particle of mass m carrying charge q is moving in a plane with speed

v

under the influence of magnetic field

\vec{B}

. The magnetic moment of this moving particle :

(1) $\frac{mv^2\vec{B}}{2B^2}$
(2) $-\frac{mv^2\vec{B}}{2B^2}$ Official answer
(3) $-\frac{mv^2\vec{B}}{2\pi B^2}$
(4) $-\frac{mv^2\vec{B}}{B^2}$

Official answer

Option 2

NTA final key (Sep 2020).

Chapter: Moving Charges and Magnetism
Topic: Magnetic Dipole Moment
Idea tested: Moment of a rotating point charge

Same topic in other shifts

All Magnetic Dipole Moment questions

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.