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A bar magnet is oscillating in the earth...

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

A

motion remains simple harmonic with new period = T/2

B

motion remains simple harmonic with new period = 2 T

C

motion remains simple harmonic with new period = 4T

D

motion remains simple harmonic and the period stays nearly constant

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