人教版普通高中课程标准实验教科书选修2-1第35页,人教版2002年物理第二册必修加选修第155页,是研究安培力的大小与哪些因素有关,通过演示实验,得出通电导体长度一定时,电流越大,导线所受安培力越大;电流一定时,通电导线越长,安培力越大.但这个实验只能得到定性的结论,不能说明正比例关系,即不能通过这个实验得到F= BIL这个公式.为了解决这个问题,我们对测量仪器进行了改进. PEP ordinary high school curriculum standard experimental textbook elective 2-1 page 35, PEP 2002 Physics Volume II compulsory plus elective 155, is to study the size of Amphenol and what factors, through the demonstration experiment, come to When the length of the conducting conductor is constant, the larger the current, the larger the amperage of the conducting wire. When the current is constant, the longer the conducting wire is, the larger the amperage is. However, this experiment can only get qualitative conclusion and can not indicate the positive relation In this experiment, the formula F = BIL is obtained. In order to solve this problem, we have improved the measuring instrument.