在使用直流电的地方即产生人为的静电磁场，例如在电车或诸如铝生产和气焊等工业操作程序中。
Man-made static magnetic fields are generated wherever DC currents are used, such as in electric trains or industrial processes such as aluminium production and in gas welding.
使用直流电是产生静电磁场的另一个原因，例如铁路系统使用直流电，电视和计算机屏幕带有阴极放射管。
The use of DC electricity is another source of static electric fields, e.g. rail systems using DC, and televisions and computer screens with cathode ray tubes.
将任意分布的电流源产生的电磁场看作是电偶极子产生的电磁场的叠加，利用镜像法推导了上半空间中的垂直直流电偶极子在两层媒质中产生电磁场的解析解。
The analytical expressions of the electromagnetic field generated by the DC electric dipole in the upper space for the two-layer mode were obtained by using the method of mirror image.
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