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Questions  

The period of oscillation of a vibration magnetometer depends on which of the following factors?
where I is the moment of inertia of the magnet about the axis of suspension, M is the magnetic moment of the magnet and H is the external magnetic field 

a
I and M only
b
M and H only
c
I and H only
d
I, M and H

detailed solution

Correct option is D

T=2πIMBH

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