JEE Main 2022 · PhysicsNumerical answerNumerical valueMediumCalculation

JEE Main 28 June 2022, Shift 1, Physics Q59

Question 59 of 90 in this shift, Physics question 29 of 30, Section B.

A singly ionized magnesium atom (A=24) ion is accelerated to kinetic energy 5 keV, and is projected perpendicularly into a magnetic field B of the magnitude 0.5 T. The radius of path formed will be ________ cm.

Official answer

NTA final key.

Chapter: Moving Charges and Magnetism
Topic: Lorentz Force
Idea tested: Circular Motion in Uniform B-Field

Same idea in other shifts

Asked 7× in all

7 Apr 2025, Shift 1 · Q40Uniform magnetic fields of different strengths ( $B_1$ and $B_2$ ), both normal to the plane of the paper exist as shown in the figure. A…HardDiagram basedHas a figure
25 Jul 2022, Shift 2 · Q41An electron with energy 0.1 keV moves at right angle to the earth's magnetic field of $1 \times 10^{-4}$ Wbm $^{-2}$ . The frequency of…MediumSingle correct
4 Aug 2021, Shift 1 · Q9Assume there is a possibility of constant Electric field and Magnetic field and a charged particle under the influence of these forces…EasySingle correct
25 Jul 2021, Shift 2 · Q14Two ions having same mass have charges in the ratio 1 : 2. They are projected normally in a uniform magnetic field with their speeds in…EasySingle correct
18 Mar 2021, Shift 2 · Q16A proton and an $\alpha$ -particle, having kinetic energies $K_p$ and $K_\alpha$ respectively, enter into a magnetic field at right angles.…MediumSingle correct
9 Jan 2020, Shift 2 · Q14An electron gun is placed inside a long solenoid of radius $R$ on its axis. The solenoid has $n$ turns/length and carries a current $I$ .…MediumSingle correctHas 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.