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 -

NEET 2003 Physics question

Not in JEE Advanced syllabus

A bar magnet is oscillating in the Earth's magnetic field with a period . What happens to its period and motion if its mass is quadrupled -

(1)Motion remains S.H. with time period =
(2)Motion remains S.H. with time period = Correct
(3)Motion remains S.H. with time period =
(4)Motion remains S.H. and period remains nearly constant

Answer: (2)

Solution

Time period of a bar magnet in a uniform field: , where is the magnetic moment and the field. For a magnet of the same shape and size, the moment of inertia is proportional to its mass:

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Question ID VK-089162