You place a magnetic compass on a horizontal surface, allow the needle to settle into its equilibrium position, and then give the compass a gentle wiggle to cause the needle to oscillate about that equilibrium position. The frequency of oscillation is 0.312Hz. Earth\"s magnetic field at the location of the compass has a horizontal component of 18.0 ÂľT. The needle has a magnetic moment of 0.680 m J/T. What is the needle\"s rotational inertia about its (vertical) axis of rotation?
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