JEE Main 2020PhysicsMagnetic Effects of CurrentMediumMCQ

JEE Main 2020 — Magnetic Effects of Current Question with Solution

JEE Main 2020 (02 Sep Shift 1)

Question

A beam of protons with speed 4×105 m s-1 enters a uniform magnetic field of 0.3 T at an angle 60° to the magnetic field, the pitch of the resulting helical path of protons is close to : (Mass of the proton=1.67×10-27 kg, charge of the proton=1.69×10-19C)

Choose an option

Show full solutionCorrect option: D
Correct answer
D4 cm

Step-by-step explanation

Pitch

=(Vcosθ)T

=(Vcosθ)2πmeB

=4×105cos60°2π0.3×101.67×10-271.69×1019

4 cm

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About this question

This is a previous-year question from JEE Main 2020, 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.