A small bar magnet has a length equal to and its magnetic

Chapter , Problem 54

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A small bar magnet has a length equal to and its magnetic moment is aligned with a uniform magnetic field of magnitude The bar magnet is then rotated through an angle of about an axis perpendicular to its length. The observed torque on the bar magnet has a magnitude of (a) Find the magnetic moment of the magnet. (b) Find the potential energy of the magnet.

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