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 $H$ only

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