A criterion of zero magnetic field point, which is related with the symmetryof current-carrying system, is derived from a simple problem.
从一个简单问题出发,引出关于磁场零值点的一个判据,该判据与载流系统的几何对称性有关。
2
With the structure symmetry, the expressions of the electric-field on the point of a half conductor cylinder are given, and the electric-field characteristics are analyzed.
利用其结构的空间对称性,计算出该理想模型半球壳顶端附近的电场表达式,并对电场特性作简单分析。
3
The conservation principle of orbital symmetry may be represented as conservation law of bond symmetry, by means of group theory and the point of view of the localized bonds.