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A magnetic needle pivoted through it ce...

A magnetic needle pivoted through it centre of mass and free to rotate in a plane containing a uniform magnetic field of 100 G is displaced slightly from its stable equilibrium . The frequency of its angular oscillations of small amplitudes is measured to be `1.5 s^(-1)` . If the moment of inertia of the needle about its axis of rotation is `0.75 xx 10^(-5) kg m^(2)` , determine the magnetic moment of the needle.

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The correct Answer is:
`0.067 JT^(-1)`
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SL ARORA-MAGNETISM-Based on (i) Earth s Magnetism (ii) magnetic field of a bar magnet
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