A bar magnet takes π/10 second to complete one oscillation in an oscillation magnetometer. The moment of inertia of the magnet about the axis of rotation is 1.2 × 10^–4 kg m² and the earth’s horizontal magnetic field is 30 μT. Find the magnetic moment of the magnet.

Question

Philoid · Accepted Answer

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Given,

the earth’s horizontal magnetic field,

The moment of inertia of the magnet about the axis of rotation

the time period of a magnetometer is given by,

M = 1600Am²

A bar magnet takes π/10 second to complete one oscillation in an oscillation magnetometer. The moment of inertia of the magnet about the axis of rotation is 1.2 × 10–4 kg m2 and the earth’s horizontal magnetic field is 30 μT. Find the magnetic moment of the magnet.