在电磁感应现象中会不会产生动生电动势,需要判断导体是否在切割磁感线运动.什么是“切割”?什么又是“不切割”?一般的教材和教辅资料并没有给出一个普遍适用、直观简单的判断方法.本刊2010年第6期《导体是否切割磁感线运动的界定方法》一文给出如下方法:引入“导体运动平面”(即导体速度与导体决定的平面)的概念,如果磁场的B矢量与导体运动平面为平行关系,则为“不切割”的情况;当B矢量与 In the phenomenon of electromagnetic induction will not have dynamic electromotive force, the need to determine whether the conductor in the magnetic induction cutting line movement. What is “cutting” and what is “not cutting”? General teaching materials and supplementary materials and The article gives the following method: “the conductor movement plane” (that is, the conductor speed And the conductor determines the plane) concept, if the magnetic field B vector and the conductor plane of motion for the parallel relationship, it is “not cut ” situation; when the B vector and