当学生学习了高二物理电磁场部分后，对左手定则和右手定则经常混淆不清，尽管老师反复强调，判断磁场对电流的作用力要用左手定则，判断感应电流的方向要用右手定则，但学生还是经常出错，笔者根据自己多年的教学实践，总结了二句口诀，学生记起来非常容易，做起来形象直观， When the students studied the physical part of the second year of the physical electromagnetic field, they often confused the left-hand rule and the right-hand rule. Although the teacher repeatedly emphasized that the force of the magnetic field on the current should be determined by the left hand rule, the direction of the induced current should be determined by the right hand. However, the students still often make mistakes. According to their own years of teaching practice, the author summarizes the two sentences, the students remember it very easily, and the images are intuitive.