初中物理第二册有“电流的磁场”一节。讲完用安培定则Ⅰ判定直线电流周围的磁力线方向跟电流方向之间的关系后,要介绍用安培定则Ⅱ来判定通电螺线管的磁极性质跟电流方向的关系。对本节教材的处理,我们作了一点尝试:在新授安培定则Ⅱ之前,对学生已经掌握的安培定则Ⅰ进行拓展,从而过渡到新授内容,收到了良好效果。 Junior High School Physics Book 2 has a section called “The Magnetic Field of Currents”. After the relationship between the direction of the magnetic flux around the linear current and the direction of the current is determined by using Ampere’s rule I, the relationship between the polarity of the current-carrying solenoid and the direction of the current is determined by the Ampere Code II. We have made some attempts to deal with the teaching materials of this section: Prior to the new Ancestral Code II, we have expanded the ampacity I that the students have mastered so that we can transition to the new content and receive good results.