在有些电磁感应现象中,我们从导体切割磁感线的角度来看,回路中产生了感应电动势或感应电流,但却难以觉察到磁通量变化,这与法拉第电磁感应定律发生了冲突。确定导体在切割磁感线运动中导体所在回路存在磁通量变化,是化解矛盾的根本所在,以下举例说明。一、画全导体回路所围空间的磁感线分布以显化导体运动过程中的磁通量变化例1如图1所示,在圆柱形铁芯上绕有多匝线圈,线圈与铁芯共轴,且处在辐向磁场中,当线圈从图 In some electromagnetic induction phenomena, we have induced electromotive force or induced current in the circuit from the point of view of the magnetic induction lines cut by the conductor, but we can hardly detect the change of the magnetic flux, which collides with Faraday’s law of electromagnetic induction. Determining the change of magnetic flux in the loop where the conductor is located during cutting magnetic induction line movement is the fundamental solution to the conflict, as illustrated below. First, draw the conductor loop around the space around the magnetic induction line distribution to show the movement of the conductor during the magnetic flux change Example 1 As shown in Figure 1, a multi-turn around the cylindrical iron core coil, coil and core coaxial , And in the radial magnetic field, when the coil from the figure