derive an expression for the magnetic field at a point on the equatorial line of a magnetic dipole
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The equatorial line of a bar magnet is a straight line perpendicular to its axial line and passing through its centre. The magnetic moment M of a magnet is defined as the product of its magnetic length 2l and its pole strength m. Therefore, M = 2lm. ... NS is the bar magnet of length 2l and pole strength m.
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