A criterion of zero magnetic field point, which is related with the symmetry of 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。
The magnetic field of overall space displacement current excited at any point is always proved tobe zero.
本文证明了在似稳恒条件下，全空间的位移电流在任何一点激发的磁场恒为零。
In order to make sure the magnetic field distribution around the magneto optical trap cold atoms, the weak variation and distribution around the zero point magnet field can be analyzed.
为了研究磁光阱冷原子团所在区域的磁场大小，从而得出磁场零点附近磁场的微弱变化及其分布。
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