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一、引言高中《物理》第二册“磁场”一章中,电流产生磁场是个重点.教材对此安排了一个奥斯特实验,如图1所示.这个实验可以证实电流周围有磁场存在,但还有另外几个问题:1.磁场方向往往要受到地磁场力的影响,不能完全由磁针N极的指向反映出电流磁场的方向.2.磁针水平转动可见度小,学生不易观察.3.实验无法帮助学生进行电流周围的磁感强度
I. INTRODUCTION In the “Volume II” and “Magnetic Field” chapters of “Physics” in high schools, the magnetic field produced by currents is a key point. The textbook has arranged an Auster experiment as shown in Figure 1. This experiment can confirm the magnetic field around the current. There are, but there are several other issues: 1. The direction of the magnetic field is often affected by the magnetic force of the earth’s magnetic field, and the direction of the magnetic field cannot be completely reflected by the magnetic pole’s N pole. 2. The horizontal rotation of the magnetic needle has a low visibility, which makes it difficult for students to observe. 3. The experiment can not help the students to magnetic induction intensity around the current