JEE Main 2017PhysicsMagnetic Properties of MatterEasyMCQ

JEE Main 2017 — Magnetic Properties of Matter Question with Solution

JEE Main 2017 (02 Apr)

Question

A magnetic needle of magnetic moment 6.7×10-2 A m2 and moment of inertia 7.5×10-6 kg m2 is performing simple harmonic oscillations in a magnetic field of 0.01 T. Time taken for 10 complete oscillations is:

Choose an option

Show full solutionCorrect option: B
Correct answer
B6.65 s

Step-by-step explanation

Time period of oscillating magnetic needle is   T=2πIMB

=2π7.5×10-66.7×10-2×0.01 sec

=0.6647 sec

Time for oscillations, t=10 T=6.647 sec⁡=6.65 sec

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About this question

This is a previous-year question from JEE Main 2017, covering the Magnetic Properties of Matter 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.