电磁学中,安培定则、左手定则和右手定则各自独立。但是学生在使用这三个定则的时候常常会用错手,虽然反复强调“因电而动”要用左手定则判断安培力,“因动生电”则要用右手定则来判断感应电流的方向,但是学生还是一直会用错手而导致分析错误。如果能有个“万能公式”来解决这些问题多好,那么这些定则有没有什么相同的规律呢?在教学中我尝试从数学角度来寻找三个定则的共同点,把矢量叉乘与右手螺旋定则相 Electromagnetism, Ampere’s rules, left-hand rule and right-hand rule are independent. However, students often use the wrong hand when using these three rules, although repeatedly stressed that “because of electricity and moving” to determine the amperage with the left hand rule, “ Then to determine the direction of the induced current, but students still use the wrong hand will lead to analysis error. If there is a ”universal formula" to solve these problems, what are the same rules for these rules? In teaching, I try to find the common ground between the three rules from a mathematical point of view, Multiply with right-handed spirals