在目前高中物理课堂教学中,常用的演示楞次定律的实验装置是楞次定律演示器.它由一个带针尖的支座和转动体两部分构成.转动体是一条金属片两端对称地固连一个闭合的铝环和有开口的铝环(图1).演示时,教师手执条形磁铁分别插入两只环内.当把磁铁插入闭合铝环时转动体有明显的偏转,而插入不闭合的铝环时转动体不动. In the current high school physics classroom teaching, the experimental device used to demonstrate Lenz’s law is the Lenz’s Law demonstrator. It consists of a needle bearing and a rotating body. The rotating body is a piece of metal at both ends symmetrically. With a closed aluminum ring and an open aluminum ring (Fig. 1). During the demonstration, the teacher holds the bar magnets and inserts them into the two rings. When the magnet is inserted into the closed aluminum ring, the rotating body is deflected and the insertion is obvious. 1. The rotating body does not move when it is not closed.