稳恒电场（steady electric field）就是不随时间变化的电场。在稳恒情况下，一切物理量都不随时间变化，电荷分布当然也是如此。从这个意义上说，稳恒电场同静电场相同，静电场所遵从的基本规律（高斯定理和安培环路定理）在稳恒电场中仍然成立。但是静电场除了要求电荷分布不随时间变化外，还要求电荷不流动。
本文主要研究稳恒磁场、直流电场以及电磁场对铝硅合金凝固过程及组织性能的影响。
This article mainly talks about the impacts of static magnetic field, direct current electric field and electromagnetic field on the Al-Si alloy solidification process and organizational performance.
在用稳恒电流场模拟静电场的实验中，人们通常忽略了电极与导电纸之间的接触压降。
In the experiment of simulating electrostatic field in the field of constant electric current contact voltage between electrode and conduction paper is often neglected.
本文从教学的角度，应用狭义相对论原理推早、证明静电场与恒稳磁场的相互联系，深刻揭示了静电场与恒稳磁场都是电磁场在不同参照系中的不同表现形式而己。
From a teaching point of view, the author derives and proves the interrelation between electrostatic field and constant magnetic field in the light of the special theory of relativity.
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