Please explain the following 35th question with reason.

Dear Student
T =2πImB
The moment of inertia (I) depends upon the length of magnet. Pole strength also plays a role in time period. The magnetic field term appearing ‘B’ in the formula is the ‘Horizontal component of earth’s magnetic field’. Since the magnet is freely suspended, it means it can oscillate in the horizontal plane only, so nothing to do with the vertical component.

The time period depends on Inertia and magnetic moment (length) of the magnet.
Therefore time period does not depend on length of the suspension i.e. length of thread to which magnet is tied.


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