两类镜象电流对的磁场

THE MAGNETIC FIELDS OF TWO TYPES OF CURRENT PAIR WITH MIRROR SYMMETRY

从磁场矢势出发,研究了两类镜象电流对磁场的特点,得出了这两类镜象电流对在其镜平面上激发的磁场的矢势和磁感应强度与镜平面的关系,以及其量值是一电流元激发磁场相应量的两倍的结论。进而讨论了上述结论在磁场镜象法和对称电流系统(如直螺线管和螺绕管)磁场分析中的应用。

In view of the vector potential, the magnetic fields due to two types of current pair with mirror symmetry are analysed and two conclusions are drawn. These conclusions express the direction relationship among the vector potential, magnetic induction and mirror plane, and show that the magnitudes of some components of the vector potential and magnetic induction are double those due to one current. Further, application of these conclusions to image method and analysis of the symmetry current systems, for example, of solenoid and tosoid is discussed.