# magnetic pole

magnetic pole
1. the region of a magnet toward which the lines of magnetic induction converge (south pole) or from which the lines of induction diverge (north pole).
2. either of the two points on the earth's surface where the dipping needle of a compass stands vertical, one in the arctic, the other in the antarctic. See maps under North Pole, South Pole.
[1695-1705]

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region at each end of a magnet where the external magnetic field is strongest. A bar magnet suspended in the Earth's magnetic field orients itself in a north–south direction. The north-seeking pole of such a magnet, or any similar pole, is called a north magnetic pole. The south-seeking pole, or any pole similar to it, is called a south magnetic pole. Unlike poles of different magnets attract each other; like poles repel each other.

The magnetic force between a pole of one long bar magnet and that of another was described by an inverse square law as early as 1750. If, for example, the separation between the two poles is doubled, the magnetic force diminishes to one-fourth its former value.

Breaking a magnet in two does not isolate its north pole from its south pole. Each half is found to have its own north and south poles. Magnetic forces, in fact, cannot be traced to unit magnetic poles of submicroscopic size in direct contrast to electric forces that are caused by actual discrete electric charges, such as electrons and protons. Indeed, magnetic forces themselves also fundamentally arise between electric charges when they are in motion. See also magnetic dipole.

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Universalium. 2010.

### Look at other dictionaries:

• Magnetic pole — may refer to: One of the two ends of a magnet The magnetic poles of astronomical bodies, a special case of magnets, two special cases of which are the Geomagnetic poles: The North Magnetic Pole of planet Earth, a point where the north end of a… …   Wikipedia

• Magnetic pole — Pole Pole, n. [L. polus, Gr. ? a pivot or hinge on which anything turns, an axis, a pole; akin to ? to move: cf. F. p[^o]le.] 1. Either extremity of an axis of a sphere; especially, one of the extremities of the earth s axis; as, the north pole.… …   The Collaborative International Dictionary of English

• magnetic pole — n. 1. Either of two points where the lines of force of the earth s magnetic field are vertical. [WordNet 1.5] 2. One of the two ends of a magnet where the magnetic field is strongest. [WordNet 1.5] …   The Collaborative International Dictionary of English

• magnetic pole — n. 1. either pole of a magnet, where the magnetic lines of force seem to be concentrated 2. either point on the earth s surface toward which the needle of a magnetic compass points: the north and south magnetic poles do not precisely coincide… …   English World dictionary

• magnetic pole — ► NOUN 1) each of the points near the extremities of the axis of rotation of the earth where a magnetic needle dips vertically. 2) each of the two points of a magnet to and from which the lines of magnetic force are directed …   English terms dictionary

• Magnetic pole — Magnetic pole. См. Магнитный полюс. (Источник: «Металлы и сплавы. Справочник.» Под редакцией Ю.П. Солнцева; НПО Профессионал , НПО Мир и семья ; Санкт Петербург, 2003 г.) …   Словарь металлургических терминов

• magnetic pole — noun 1. either of two points where the lines of force of the Earth s magnetic field are vertical • Hypernyms: ↑geographic point, ↑geographical point 2. one of the two ends of a magnet where the magnetism seems to be concentrated • Syn: ↑pole •… …   Useful english dictionary

• magnetic pole — UK / US noun [countable] Word forms magnetic pole : singular magnetic pole plural magnetic poles 1) science a place on the Earth near the North Pole or the South Pole that a compass points towards 2) physics either end of a magnet, where its… …   English dictionary

• magnetic pole — magnetinis polius statusas T sritis automatika atitikmenys: angl. magnetic pole vok. magnetischer Pol, m; Magnetpol, m rus. магнитный полюс, m pranc. pôle magnétique, m …   Automatikos terminų žodynas

• magnetic pole — magnetinis polius statusas T sritis fizika atitikmenys: angl. magnetic pole vok. magnetischer Pol, m; Magnetpol, m rus. магнитный полюс, m pranc. pôle magnétique, m …   Fizikos terminų žodynas