The electromagnetic momentum of static charge-current distributions

被引：5
|
作者：
Franklin, Jerrold [1 ]
机构：
[1] Temple Univ, Dept Phys, Philadelphia, PA 19122 USA
来源：
AMERICAN JOURNAL OF PHYSICS | 2014年 / 82卷 / 09期
关键词：
HIDDEN MOMENTUM; FIELD; FORCES;
D O I：
10.1119/1.4879539
中图分类号：
G40 [教育学];
学科分类号：
040101 ; 120403 ;
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. (C) 2014 American Association of Physics Teachers.
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页码：869 / 875
页数：7
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