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A bar magnet is oscillating in the earth’s magnetic field with a period T. What happens to its period of motion, if its mass is quadrupled?

1. motion remains simple harmonic with new period = T/2
2. motion remains simple harmonic with new period = 2T
3. motion remains simple harmonic with new period = 4T
4. motion remains simple harmonic and the period stays nearly constant

Correct answer: motion remains simple harmonic and the period stays nearly constant

Solution

The period of oscillation of a bar magnet in the Earth's magnetic field is independent of its mass. It depends on the magnetic moment and the magnetic field strength, so the period remains nearly constant.

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