静电荷电流分布的电磁动量
The electromagnetic momentum of static charge-current distributions
摘要：
一般静态电荷电流分布的电磁动量的起源进行检查。通过对机械动量和电磁动量之和实施动量守恒，导出了静态电磁场的电磁动量。在产生最终的静态结构的过程中，保持物质静止所需的外力产生了电磁动量。给出了静电场和磁场中电磁动量的例子。“能量中心”定理被证明是违反电磁动量。“隐藏的动量”一般不存在，也不能抵消电磁动量。
英文摘要：
The origin of electromagnetic momentum for general static charge-current distributions is examined. The electromagnetic momentum for static electromagnetic fields is derived by implementing conservation of momentum for the sum of mechanical momentum and electromagnetic momentum. The external force required to keep matter at rest during the production of the final static configuration produces the electromagnetic momentum. Examples of the electromagnetic momentum in static electric and magnetic fields are given. The `center of energy' theorem is shown to be violated by electromagnetic momentum. `Hidden momentum' is shown to be generally absent, and not to cancel electromagnetic momentum.
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