JEE Main 2021PhysicsMagnetic Effects of CurrentMediumMCQ

JEE Main 2021 — Magnetic Effects of Current Question with Solution

JEE Main 2021 (25 Jul Shift 2)

Question

Two ions having same mass have charges in the ratio 1: 2. They are projected normally in a uniform magnetic field with their speeds in the ratio 2: 3. The ratio of the radii of their circular trajectories is,

Choose an option

Show full solutionCorrect option: B
Correct answer
B4 : 3

Step-by-step explanation

R=mvqB⇒R1R2=mv1q1 Bmv2q2 B=v1q1×q2v2=q2q1×v1v2

=21×23=43

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About this question

This is a previous-year question from JEE Main 2021, 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.