A vibration magnetometer consists of two identical bar magnets, placed one over the other such that they are perpendicular and bisect each other. The time period of oscillation in a horizontal magnetic field is 
. One of the magnets is removed, and if the other magnet oscillates in the same field, then the time period (in seconds) is
A
B
C
2
D
Text Solution
Verified by ExpertsThe correct answer is:
C
Initially magnetic moment of system,
Moment of inertia,
.
Finally, when one of the magnet is removed, then
and 
So 
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Magnetic lines of force: