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File:21. Ленцово правило – прстен 01.ogv

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Македонски: Опит кој го прикажува Ленцовото правило со мала направа во облик на вага, на чии краци се наоѓаат два алуминиумски прстена кои лесно се движат во хоризонтална рамнина. Едниот е затворен, а другиот е подотворен. Кога до прстенот ќе се доближи прачкест магнет, прстенот се одбива од него. Меѓутоа, кога системот ќе се смири, магнетната прачка се вади од прстенот, тој се доближува до магнетот. Во првиот случај, индуцираната струја создадена во прстенот се спротивставува на растењето на флуксот, кое е условено со доближувањето на магнетот, додека при вадењето на магнетот доаѓа до намалување на магнетниот флукс, поради што се индуцира таква струја чие магнетно поле се спровтиставува на намалувањето на флуксот.

Ако опитот се повтори така што магнетната прачка се внесува или вади од другиот (пресечениот) простен, појавата ќе ја нема. Таму индуцираните струи не можат да се затворат во прстенот, па тие создаваат многу слабо поле кое не може да се спротивстави на промената на магнетиот флукс.

Подготвено, изведено и објасенто од проф. Оливер Зајков. Институт за физика на Природно-математичкиот факултет во Скопје.
English: Experiment showing Lenz's law with two aluminium rings on a scales-like device set up on a pivot so as to freely move in the horizontal plane. One ring is fully enclosed, while the other has an opening, not forming a complete circle. When we place a bar magnet near the fully enclosed ring, the ring is repulsed by it. However, when the system comes to a rest, and we remove the bar magnet, then the ring is attracted by it. In the first case, the induced current created in the ring resists the increase of magnetic flux caused by the proximity of the magnet, while in the latter, taking the magnet out of the ring decreases the magnetic flux, inducing such current whose magnetic field resists the decrease of flux.

This phenomenon is absent when we repeat the experiment with the ring that isn't enclosed by inserting and removing the magnet bar. The induced currents in this ring can't enclose themselves in the ring, and have a very weak field that cannot resist the change of the magnetic flux.

Prepared performed and explained by Prof. Oliver Zajkov at the Physics Institute at the Ss. Cyril and Methodius University of Skopje, Macedonia.
Français : Démonstration de la loi de Lenz à l'aide d'un montage de deux anneaux d'aluminium disposés de par et autre d'une tige soutenue sur une pointe et libre de tourner selon le plan horizontal. L'un des deux anneaux n'est pas complètement fermé.
Lorsqu'un aimant est passé à travers l'anneau fermé, celui-ci est repoussé par le champ magnétique induit (loi de Lenz). En revanche, la même manipulation effectuée sur l'anneau ouvert ne produit aucun effet perceptible, le courant induit ne pouvant pas circuler entièrement dans celui-ci.
Expérience réalisée et expliquée par le professeur Oliver Zajkov de l'Institut de physique de l'université Saints-Cyrille-et-Méthode de Skopje de Macédoine.
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Author Andrejdam

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21 September 2015

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