一、问题的提出这节课在一所上海市实验性示范性高中进行教学,执教者陆老师是某区一位名优教师。课前,黑板及PPt上呈现了课题:磁场对电流的作用——左手定则。课堂教学整个过程分三个环节:第一,课的开始由实验情境引入,从中得出磁场对电流有作用力这个结论;第二,运用实验方法进行探究,讨论磁场力方向与哪些因素有关; First, the question raised This lesson in an experimental demonstration of high school in Shanghai for teaching, coaches Lu teacher is a famous teacher in a district. Pre-class, blackboard and PPt presents the subject: the role of magnetic field on the current - left-hand rule. The whole process of classroom teaching is divided into three parts: first, the beginning of the lesson is introduced from the experimental situation, and the conclusion that the magnetic field exerts a force on the current can be drawn; second, the experimental method is used to explore and discuss the factors of the magnetic field force;