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一段载流导线元在磁场中会受到力的作用,此力称为安培力。其大小和方向可由安培公式dF_α=Idl×B给出,其中dl是导线元矢量,它的方向和导线元中电流密度矢量j一致,B是外磁场的磁感应强度矢量,安培力dF_α的方向垂直于dl和B两矢量。为什么载流导线元在外磁场中会受到力的作用呢?目前常见的“物理学”和“电磁学”教科书中均认为这是由于导线元中电流是自由电子的定向运动所致,而自由电子在磁场中作定向运动会受到罗仑兹力作
A current carrying wire element in the magnetic field will be subjected to force, this force is called ampere. Its size and direction can be given by the ampere formula dF_α = Idl × B, where dl is the wire element vector, its direction and the wire element current density vector j, B is the magnetic field of the magnetic flux density vector, Ampere force dF_α direction vertical In dl and B two vector. Why current carrying wire elements in the external magnetic field will be subjected to force? Common “Physics” and “Electromagnetics” textbooks are that this is due to the wire element current is free electrons due to the directional movement caused by the free electrons In the magnetic field for directional movement will be Lorentz force