derive equation for magnetic field at the point along the axis of the bar maganet
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The magnetic field B → axial at a point P due to bar magnet will be the resultant of the magnetic fields B 1 → due to N-pole of magnet and B 2 → due to S-pole of magnet. Magnetic field due to a bar magnet at an axial point has same direction as that of its magnetic dipole moment vector
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