指闭合电路中产生电流，电流通过导体时在导体（即电流）周围产生一定范围大小的磁场，这种由电流产生的磁场叫电流的磁场。由电流的磁场可知，电流不仅具有热效应，还具有磁效应。
无限长直电流的磁场具有柱对称性。
The magnetic field of an infinite long straight current has a cylindrical symmetry.
磁铁的磁场跟电流的磁场一样，都是由电荷的运动产生的。
The magnetic field of magnet is the same with the magnetic field of electric current, they all caused by the movement of electric charges.
已经证明，感应电压使电流的方向与产生电流的磁场力方向相反。钵。
It has been proved that induced voltage causes a current to flow in opposition to the force producing it.
应用推荐