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在电磁感应现象中,导体切割磁感线运动会产生感应电动势,但什么样的情形才算是导体切割磁感线运动呢?关于这个问题各种教材或教参都没有给出比较明确统一的说明.笔者认为,导体是否切割磁感线运动可以按以下方式进行快速判断.要判断导体是否切割磁感线运动,只需要研究导体L所在直线、速度v所在直线与通过以上两直线交点的一根磁感线B3者之间的位置关系.若3线共面则导体不切割磁感线运动,如例1;若3线不共面则导体切割磁感线运
In the phenomenon of electromagnetic induction, conductor cutting magnetic induction line will produce induced electromotive force, but what kind of situation can be considered conductor cutting magnetic induction line? A variety of teaching materials or teaching on this issue are not given a more clear and uniform instructions. The author believes that whether the conductor cutting magnetic induction line movement can be quickly judged by the following way to determine whether the conductor cutting magnetic induction line movement, only the conductor L where the straight line, the speed v where the line and through the intersection of the two straight lines above a magnetic Sense of the relationship between the location of B3 B3 If the 3-line coplanar conductor is not cut magnetic induction line movement, as in Example 1; 3 lines are not coplanar conductor cut magnetic induction line