A bar magnet is oscillating in the earth's magnetic field with time period T. If its mass is increased four times then its time period will be
Text Solution
Verified by ExpertsThe correct answer is:
B
The time period of vibration magnetometer is given by
where 
is moment of inertia, 
the magnetic moment and 
the horizontal component of earth's magnetic field.
Also, 
where 
is mass and 
the radius.
When mass is increased four times. 
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