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Encyclopedia Britannica - Main :: HOR-I25 |
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HYSTERESIS (Gr. IQTEprIo-es, from vvrkpiv, to lag behind) , a term
physical
Ewing , who defines it as follows: When there are two qualities M and N such that cyclic variations of N cause cyclic variations of M, then if the changes of M lag behind those of N, we may say that there is hysteresis in the relation of M to N (Phil. Trans., 1885, 176, p. 524). The phenomenon is best known in connexion with magnetism. If an iron bar is subjected to a magnetic force which is first gradually increased to a maximum and then gradually diminished, the resulting magnetization of the bar for any given value of the magnetic force will be greater when the force -is decreasing than when it is increasing; the iron always tends to retain the magnetic condition which it has previously acquired, and changes of its magnetization consequently lag behind changes of the magnetic force. Thus there is hysteresis in the relation of magnetization to magnetic force. In consequence of hysteresis the process of magnetizing a piece of iron to a certain intensity and then restoring it to its original
condition , or of effecting a double
Electrical generators and transformers
heating
electrical machinery. (See MAGNETISM.)End of Article: HYSTERESIS (Gr. IQTEprIo-es, from vvrkpiv, to lag behind) If you wish, you can link directly to this article.
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