现行高中物理第二册第三章磁场中《磁场》一节内容,其特点是实验多,有七个实验,这七个实验所演示的磁场是看不见摸不着的。如果没有直观的演示学生是难于理解和消化的。而且要在一堂课内完成教学任务,真所谓“时间紧任务重”。为此,在这堂课里必须将这七个实 The chapter “Magnetic Field” in the magnetic field in the third chapter of the current high school physics book is characterized by many experiments and seven experiments. The magnetic fields demonstrated by these seven experiments are invisible and invisible. It is difficult to understand and digest students without an intuitive demonstration. And to complete the teaching tasks in one lesson, the so-called “time is tight with tasks.” For this purpose, these seven realities must be