JEE Main 2017 — Magnetic Properties Of Matter Question with Solution
From: JEE Main 2017 (Offline)
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
Given : Magnetic moment, M = 6.7 × 10–2 Am2
Magnetic field, B = 0.01 T
Moment of inertia, I = 7.5 × 10–6 Kgm2
Using, T =
=
= s
Time taken for 10 complete oscillations
t = 10T = 2 × 1.06
= 6.6568 6.65 s
Magnetic field, B = 0.01 T
Moment of inertia, I = 7.5 × 10–6 Kgm2
Using, T =
=
= s
Time taken for 10 complete oscillations
t = 10T = 2 × 1.06
= 6.6568 6.65 s
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