论文部分内容阅读
关于人教版教材选修3-1第三章磁感应强度一节,在探究影响通电导线受力的因素时,分别改变通电导线电流的大小和导线在磁场中的长度,通过观察导线摆动角度的大小定性比较导线受力的大小。在实际操作过程中笔者发现,由于实验室提供的蹄形磁铁磁场较弱,导线受到的安培力较小,学生不易观察到导线摆角的变化。另外,在改变导线在磁场中的长度时,课本采用增加磁铁的方法,但是3个磁铁的磁场并不完全相同,使得实验结论可信度降低。为了解决
About PEP Teaching Materials Elective 3-1 Chapter 3 Magnetic Induction Section When exploring the factors that affect the force of conductive wires, we change the current of the conductive wires and the length of the conductive wires in the magnetic field, respectively. By observing the size of the wire swinging angle Qualitative comparison of the size of the wire force. In the actual operation process, I found that due to the magnetic field of the hoop-shaped magnet provided by the laboratory is weak, the amperage of the wire is small, and the change of the wire swing angle is hard to be observed by students. In addition, when changing the length of the wire in the magnetic field, the textbook adopts the method of adding magnets, but the magnetic fields of the three magnets are not exactly the same, so that the reliability of the experimental conclusion is reduced. In order to solve