一个不能满足于牛顿第三定律的物理实验

受磁场对载流导线有力的作用和牛顿第三定律的启发 ,希望制造一种新型的直流电动机。然而失败了。在找寻失败原因的实验中发现了如下物理现象 :以电磁相互作用的两个物体 ,在发生相互作用时 ,作用在两物体等效作用点上的二力虽然大小相等方向相反 ,但是该二力可以不在一条直线上。

Inspired by the force action caused by magnetic field to current  carrying conductor and Newton's third law, we tried to make a new type of DC motor, yet we failed. In analyzing the cause of the failure, we find a physical phenomenon which does not harmonize Newton's third law: when two objects interact electro  magnetically with each other, the two forces put on the two objects at their equivalent action spots are equal and their directions are opposite, but the two forces can be on different lines.