由于磁场的变化或者导体与磁场之间相对位置改变引起闭合回路所包围的磁通量发生改变,闭合回路中产生感应电流,磁场对感应电流发生作用,使处于磁场中的导体受到安培力的作用,物体的受力发生变化,运动状态发生改变,致使磁场与导体之间的空间位置变化产生制约,这种关系就是电磁感 Due to the change of the magnetic field or the change of the relative position between the conductor and the magnetic field, the magnetic flux enclosed by the closed circuit changes, an induced current is generated in the closed circuit, the magnetic field acts on the induced current, and the conductor in the magnetic field is subjected to an amperage force. The force changes, and the state of motion changes, resulting in the restriction of the spatial position between the magnetic field and the conductor. This relationship is the electromagnetic sense.