从经典电磁场理论出发，主要介绍了傍轴近似条件下，光束的轨道角动量和光束的参数之间的关系。
Based on the classical theory of electromagnetism, the relation and the difference between OAM and the parameter of the beam in paraxial approximation are analyzed.
从一个佯谬问题出发，利用数学计算的方法，得出了稳态电磁场动量守恒的结论。
From a sham false question, used the method of math calculate, received conservation of momentum's conclusion to steady-state electrical and magnetism.
利用简单对称性的电磁场，讨论了场和电荷系统遵从的动量守恒、量矩守恒定律。
With a simple symmetrical electromagnetic field, the law of conservation of momentum and the law of conservation of angular momentum for electromagnetic field and charges system are investigated.
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