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Derive an expression for torque acting o...

Derive an expression for torque acting on a bar magnet placed in a uniform magnetic field.

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Magnetic dipole moment: It is defined as the product of pole strength of either pole and distance between the two poles of a magnet (magnetic length).
Torque acts on a bar magnet when it is placed in uniform magnetic field and then in that case SI unit of magnetic dipole moment is Joule per Tesla `(JT^(-1))`
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