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AIIMS2018PhysicsMagnetic Properties of Matter

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 , angular acceleration is (magnetic induction of earth's horizontal field is B_H )

Options

  1. AM B_H I
  2. BI B_H M
  3. CM I B_H
  4. DI M B_H

Correct answer

A. M B_H I

Step-by-step solution

Restoring torque on the magnet, =-2 m B_H l =-M B_H if is small =-M B_H ; = M B_H I

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