A bar magnet of moment of inertia I is vibrated in a magnetic field of induction 0.4×10⁻⁴ T. The time period of vibration is 12 s. The magnetic moment of the magnet is 120Am². The moment of inertia of the magnet is (in kgm²) approximately
Options
(a) 172.8×10⁻⁴
(b) 2.1×10⁻²
(c) 1.57×10⁻²
(d) 1728×10⁻²
Correct Answer:
172.8×10⁻⁴
Explanation:
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