This cancellation is greatest when the poles are close to each other i.e. ![]() Since magnetic poles always come in pairs, their forces partially cancel each other because while one pole pulls, the other repels. Each pole is the source of magnetic force which weakens with distance. Consider a bar magnet which has magnetic poles of equal magnitude but opposite polarity. The sources of magnetic moments in materials can be represented by poles in analogy to electrostatics. Magnetic pole definitionĪn electrostatic analogue for a magnetic moment: two opposing charges separated by a finite distance. Most recent textbooks define it in terms of Ampèrian currents. In pre-1930's textbooks, they were defined using magnetic poles. In text books, two complementary approaches have been used to define magnetic moments. 5.3 Forces between two magnetic dipoles.5.2 Internal magnetic field of a dipole.5.1 External magnetic field produced by a magnetic dipole moment.3 Effects of an external magnetic field on a magnetic moment.The dipole component of an object's magnetic field is symmetric about the direction of its magnetic dipole moment, and decreases as the inverse cube of the distance from the object. ![]() More precisely, the term magnetic moment normally refers to a system's magnetic dipole moment, which produces the first term in the multipole expansion of a general magnetic field. The magnetic field produced by a magnet is proportional to its magnetic moment as well. The direction of the magnetic moment points from the south to north pole of a magnet. ![]() A loop of electric current, a bar magnet, an electron, a molecule, and a planet all have magnetic moments.īoth the magnetic moment and magnetic field may be considered to be vectors having a magnitude and direction. The magnetic moment of a magnet is a quantity that determines the force that a magnet can exert on electric currents and the torque that a magnetic field will exert on it.
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