The potential distribution and the perturbation multipole field of the different electrode defects in some electrostatic lenses were given.
计算了几个静电电子透镜的例子，给出了不同电极缺陷的电位分布和微扰多极场分布。
General expressions of the magnetic vector potential for multipole fields are derived.
推导出了用多极场空间谐波函数表示的磁矢位的通项表达式。
Physically in consideration of the multipole moments, by using supplementing charges, there can be derived in this paper the potential at great distances due to a localized charge distribution.
本文是从电多极矩的物理意义的考虑，而用增补电荷的办法，推演出分布在小区域内的电荷系统在远处所产生的电势。
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