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Magnetic dipole in a uniform magnetic field

A short bar magnet of magnetic moment  2Am2and moment of inertia  6×102kg/m2 is freely suspended such that the magnetic axial line is in the direction of magnetic meridian. If the magnet is displaced by very small angle ( 3o), the angular acceleration is y×10-6rad/s2 . Find y. (Magnetic induction of earth’s horizontal field = 4×10-4T)


α=MBIθ=2×4×10-4×3×π6×102×180 α=π45×10-6rad/s2

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