A bar magnet of magnetic moment M and moment of inertia I is freely suspended such that the magnetic axial line is in the direction of magnetic meridian. If the magnet is displaced by a very small ang

Question

A bar magnet of magnetic moment M and moment of inertia I is freely suspended such that the magnetic axial line is in the direction of magnetic meridian. If the magnet is displaced by a very small angle θ , angular acceleration is (magnetic induction of earth's horizontal field is B H ​ )

TestHub · Accepted Answer

Restoring torque on the magnet, τ = − 2 m B H ​ l sin θ = − M B H ​ sin θ if θ is small sin θ ≈ θ I α = − M B H ​ θ ; α = I M B H ​ θ ​

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