利用特殊函数求解电势、电场，计算了点电荷与磁偶极子相互作用的电磁角动量。
The electric potential and the field of point charge are resolved with a special function.
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.
导出了电磁场的自旋角动量与内禀角动量的关系。
Besides, the conservation property of the intrinsic angular momentum, the relations between the spin angular momentum and the intrinsic angular momentum of an electroma…
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