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中学物理教学中有多种演示楞次定律的方法。本文介绍一种使用简易器材,说服力很强的新方法。取一段18厘米长的柱形磁铁,用2段细线套挂起来.再分别将闭合的和断开(带裂口)的铝质圆环也用细线垂直悬挂于磁铁两端,距磁铁约4厘米,并且力图使圆环的轴线与磁铁轴线相重合,如图所示。悬挂磁铁与圆环的4道细线都固定在木质支架的两横梁上。梁臂长27厘米左右,横梁直径约1.25厘米,两梁臂间距约20厘米。悬线应足够长,以保证磁铁能作近乎水平地沿轴向平移。
There are several ways to demonstrate Lenz’s law in physics teaching in middle school. This article describes a new method that uses simple devices and is persuasive. Take an 18-cm columnar magnet and hang it with a 2-piece thin wire sleeve. The closed and disconnected aluminum ring is also suspended vertically with a thin wire at the ends of the magnet. 4 cm, and trying to make the axis of the ring coincide with the axis of the magnet, as shown. The four thin wires of the hanging magnet and the ring are fixed on the two beams of the wooden support. The beam arm is about 27 cm long, and the beam is about 1.25 cm in diameter. The distance between the arms is about 20 cm. The suspension should be long enough to ensure that the magnet can translate axially in a nearly horizontal direction.