File:20. Валтенхофеново правило.ogv
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When a metal plate oscillates between the poles of an electromagnet, eddy currents are induced in the plate. According to Lenz's law, those currents create a magnetic field which opposes the field created by the motion of the plate, stopping it…
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Македонски: Кога меѓу половите на електромагнетот поминува полната масивна плоча, во неа се индуцираат вртложни струи. Согласно Ленцовото правило, тие струи формираат магнетно поле кое се противи на причината за неговото постоење, а тоа е движењето на плочата. Затоа таа запира. Ако на местото на масивната плоча се стави плоча која во вид на чешел, ефектот е послаб, затоа што индуцираните струи се послаби. Подготовка, изведба и објаснување: проф. Оливер Зајков. Институт за физика на Природно-математичкиот факултет во Скопје.
English: When massive metal plate oscillates between the poles of an electromagnet eddy currents are induced in the plate. According to the Lenz's rule, those currents create magnetic field, which opposes to the reason for their existence and that is the motion of the plate. That is why plate stops. If the massive plate is replaced with a comb-like plate, the effect is weaker, because eddy currents are weaker.
Prepared, performed and explained by Prof. Oliver Zajkov at the Physics Institute at the Ss. Cyril and Methodius University of Skopje, Macedonia.
Français : Démonstration des courants de Foucault.
L'oscillation d'une plaque métallique entre les deux pôles magnétiques d'un électroaimant engendre des courants de Foucault. Selon la loi de Lenz, ces courants créent un champ magnétique qui s'oppose à la source, qui est ici le mouvement de pendule. Cela a pour effet d'arrêter le mouvement. Si la plaque métallique est remplacée par une plaque en forme de peigne, les courants engendrés sont moindres, ce qui entraîne une force d'opposition moindre. 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. Română: Demonstrație a pendulului lui Waltenhofen, precursor al frânelor electromagnetice. Formarea și suprimarea curenților turbionari este ilustrată aici cu ajutorul acestui pendul, o placă metalică ce oscilează între polii unukids experimenting clip arti electromagnet puternic. După ce este instalat un câmp magnetic suficient de puternic, pendulul este împiedicat să pătrundă în câmp.
Efectuat de prof. Oliver Zajkov de la Institutul de Fizică al Universității Sfinții Chiril și Metodiu din Skopje, Macedonia. |
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| Source | Own work |
| Author | Andrejdam |
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| current | 19:45, 31 December 2015 | 51 s, 1,920 × 1,080 (37.2 MB) | Andrejdam (talk | contribs) | User created page with UploadWizard |
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