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A bar magnet takes π/10 seconds to complete one oscillation in uniform magnetic field. The moment of inertia of the magnet about the axis of rotation is 1.2 × 10–4 kgm2 and the earth’s horizontal magnetic field is 30 μT. The magnetic moment of the magnet is...........Am2

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answer is 3.

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Detailed Solution

T=2πIMBπ10=2π1.2 x 10-4M x 30 x 10-6 , M=1600 Am2
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A bar magnet takes π/10 seconds to complete one oscillation in uniform magnetic field. The moment of inertia of the magnet about the axis of rotation is 1.2 × 10–4 kgm2 and the earth’s horizontal magnetic field is 30 μT. The magnetic moment of the magnet is...........Am2