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A short bar magnet of magnetic moment 2A...

A short bar magnet of magnetic moment `2Am^(2)` and moment of inertia `6xx10^(2)kgm^(2)` is freely suspended such that the magetic axial line is in the direction of magnetic meridian. If the magnet is displaced by a very small angle `(3^(0))`,the angular acceleration is `-x10^(-6)rad//sec^(2)` (Magnetic induction of earth's horizontal field `=4xx10^(-4)T`).

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