一、问题的提出笔者在进行《楞次定律应用》的教学中,发现学生普遍对线框通过条形磁铁附近的两个特殊位置时感应电流是否为零存在疑惑,课后与其他老师交流的过程中,一些教师对此问题也存在困惑。现结合自己的教学实践,将此问题提出并予以解决。位置1:矩形框与磁铁一个极的磁感线平行如图1所示,在水平放置的条形磁铁的N极附 First, the problem put forward In the “Lenz’s law application” teaching, found that students generally through the wire bar near the bar magnet near the two special position when the induction current is zero exist doubts, after class with other teachers to communicate In the process, some teachers are also confused about this issue. Now with their own teaching practice, put forward this problem and to be resolved. Position 1: Rectangular frame and magnet One pole of the magnetic induction line parallel as shown in Figure 1, the N-pole attached to the horizontal bar magnet