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A bar magnet is oscillating in the earths magnetic field with a period T. What happens to its period of motion, if its mass is quadrupled
(a) Motion remains simple harmonic with new period = T/2.
(b) Motion remains simple harmonic with new period =2T
(c) Motion remains simple harmonic with new period = 4T
(d) Motion remains simple harmonic and the period stays nearly constant
(b)
The time period of a bar magnet in a magnetic field is given by.
Here, I = moment of inertia proportional m, M = moment of magnet,
B = magnetic field.
so, T becomes twice as mass becomes four times
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