准静态电磁系统中的线性动量密度
Linear Momentum Density in Quasistatic Electromagnetic Systems
摘要：
本文讨论了几个简单的准静态电磁系统，其中电磁线动量密度可以很容易地计算。这些例子也被用来说明如何总的电磁线动量，这也可以通过使用矢量势计算，可以被理解为违反的作用-反应原理的结果，因为需要一个非零的外力来保持恒定的机械线动量。我们展示了如何可以避免发散的相互作用线性电磁动量的系统组成的理想化经常使用的教科书（无限直电流）和点电荷。
英文摘要：
We discuss a couple of simple quasistatic electromagnetic systems in which the density of electromagnetic linear momentum can be easily computed. The examples are also used to illustrate how the total electromagnetic linear momentum, which may also be calculated by using the vector potential, can be understood as a consequence of the violation of the action-reaction principle, because a non-null external force is required to maintain constant the mechanical linear momentum. We show how one can avoid the divergence in the interaction linear electromagnetic momentum of a system composed by an idealization often used in textbooks (an infinite straight current) and a point charge.
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