一、创设情景利用在“电磁感应现象”中条形磁铁在线圈中运动的实验,回忆实验现象,教师点播引导。在重复实验操作的过程中,学生会发现在插入和拔除磁铁的过程中,分别插入和拔除不同的磁极电流计表针的偏转方向是不相同的。教师问:你能找到其中的奥妙吗?二、提出猜想思维敏锐的学生在学完前两节后意识到感应电流的方向可能与插拔磁铁的动作有关,于是大家纷纷提出了一些猜想,感应电流的方向可能与1磁场的方向2插拔磁铁的动作3磁极的 First, the creation of scenarios The use of “electromagnetic induction phenomenon” in the bar magnets in the coil movement experiments, memory test phenomenon, teachers on-demand guidance. During repetitive experiments, students will find that the direction of deflection of the hands of the ampere meter is different when inserting and removing the magnets, respectively. Teacher Q: Can you find out the mystery? Second, put forward the suspicion Think keen students after learning the first two sections after the induction current direction may be related to the action of the plug magnet, so we have put forward some conjecture, the induced current The direction of the magnetic field may be 2 with a magnetic field in the direction of insertion and removal of the magnet 3 poles