JEE Main 2021 — Magnetic Properties Of Matter Question with Solution
From: JEE Main 2021 (Online) 27th July Morning Shift
Question
In a uniform magnetic field, the magnetic needle has a magnetic moment 9.85 102 A/m2 and moment of inertia 5 106 kg m2. If it performs 10 complete oscillations in 5 seconds then the magnitude of the magnetic field is _______________ mT. [Take 2 as 9.85]
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Show full solutionCorrect answer: 8
Correct answer
8
Step-by-step explanation
B = 80 104 = 8 mT
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This is a previous-year question from JEE Main 2021, 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.