从静电模型讨论场在Lorentz力公式中的确切含义
首发时间:2016-11-30
摘要:Lorentz力公式已广泛应用于利用Maxwell方程组推导能量密度、能流密度、动量密度及张力张量等物理量。Lorentz力公式中,电场力和磁场力部分分别是依据库仑定律和宏观的安培定律或微观的洛伦兹力公式得出的。上述定律反映了电荷源、电流源或运动的电荷源在外场中的受力情况。本文对利用Lorentz力公式与Maxwell方程组研究有关电磁场物质属性的物理量时,公式中的电场和磁场是否应该包含电荷源和电流源自场的问题开展研究,并利用具体算例给予详细分析。计算结果表明:场在Lorentz力公式中指空间总场,只是在宏观、低速范畴内,电荷分布空间尺度有限的情况下,自场作用往往可以忽略。
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Study on the fields in Lorentz force formula based on several electrostatics models
Abstract:The Lorentz force formula extended from Coulomb's law and Ampere's law is generally used to analyze the material property of electromagnetic field, such as the energy density, the energy flux density, the momentum density and the stress tenser. This paper discusses the fields in the Lorentz formula in detail, through several models in electrostatics. The results show that the fields include self-fields and outing added ones. But in macroscopic, at low speed and with limited charge distribution, the effects of self-fields from charge and current are usually can be neglected.
Keywords: Lorentz force, electrostatic force self-field tension tensor of the electromagnetic field
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No.4710589116969414****
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