We can describe quantities of electric magnetic field in different inertia system, and use Lorentz transformations to educe the transformations between them.
描述电磁现象的场量在不同的惯性系中有不同的量值，利用洛伦兹变换关系式导出它们之间的变换形式。
2
We take Lorentz force as an example to discuss the mathematical characters of non-electrostatic (external)force field.
本文以罗仑兹力为例，讨论非静电力场的数字特征。
3
It is made up according to the principle of that the charged particles in the air can be acted by Lorentz force in the magnetic field.