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(一)楞次定律演示仪(作者:Don Kangas、Haym Kruglak)装置如图1所示。木制门形框架夹固在铁座支架上,使两平行杆水平。在这两杆上悬吊着一根条形磁铁和两个铝环(一个闭合、一个开口)。参考尺寸是:磁铁长18cm,门形框架的横杆长35cm、直径1.9cm(以便于用夹紧固为宜),二平行杆长27cm、直径1.25cm,铝环是将三个外径4.6cm、内径2.7cm的铝垫圈用胶带捆扎而成。须注意,悬线应足够长,使磁铁摆动时不致与铝环相碰。
(A) Lenz’s Law Demonstrator (OF: Don Kangas, Haym Kruglak) apparatus shown in Fig. The wooden truss frame is clamped on the pedestal bracket so that the two parallel bars are horizontal. A bar magnet and two aluminum rings (one closed, one opening) are suspended on these bars. The reference dimensions are: magnet length 18cm, cross-bar length 35cm, diameter 1.9cm (to facilitate fastening with a clamp), two parallel rods 27cm long, 1.25cm in diameter, aluminum rings are three outside diameter 4.6 Cm, aluminum washer with inner diameter of 2.7cm is made of tape. It should be noted that the suspension wire should be long enough so that the magnet does not collide with the aluminum ring when it swings.