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 :

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Motion remains simple harmonic with time period = T/2

Motion remains simple harmonic with time period = 2T

Motion remains simple harmonic with time period = 4 T

Motion remains simple harmonic with time period nearly constant.

answer is B.

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Detailed Solution

T=2πIMBH⇒T∝mass∴T∝4mT′=2T

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