Question

Derive the expression for torque acting on the mag dipole placed in a uniform magnetic field

Answer 1

Answer:

consider a bar magnet NS of length 2l and pole strength m placed in a uniform magnetic field of induction B at an angle thita with the direction of the field hence , moment of the magnet M is equal to the torque necessary to keep the magnet at right angles to a magnetic field of unit magnetic induction .

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