From a sham false question, used the method of math calculate, received conservation of mo- mentum, s conclusion to steady--state electrical and magnetism. Deepenedunderstanding electrical and magnetism field is concept of substance,s property.%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.目的是加深对电磁场具有物质属性概念的理解.
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