Vector potential, electromagnetic induction and ‘physical meaning’
Vector potential, electromagnetic induction and ‘physical meaning’
复制标题
矢量势、电磁感应和“物理意义”
DOI：
10.1088/0143-0807/31/4/017
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
G. Giuliani
中科院分区：
文献类型：
--
作者：
G. Giuliani
安德烈·布隆德尔（André Blondel，1914）的一个被遗忘的实验证明，磁通量的时间变化不是感应电动势的原因，而是通过项的矢势（当感应电路静止时）。由Lorenz条件和延迟公式确定了“良电磁势”。通过适当的规范函数导出的其他势对只是计算场的数学工具;它们与源没有物理关系。一个理论术语的物理意义主要依赖于理论基础;如果一个理论术语不能在不降低一个理论的预测能力的情况下被撤回，或者在较弱的意义上，如果它不能在不降低一个理论的描述能力的情况下被撤回，那么这个理论术语就具有物理意义。
A forgotten experiment by André Blondel (1914) proves, as held on the basis of theoretical arguments in a previous paper, that the time variation of the magnetic flux is not the cause of the induced emf; the physical agent is instead the vector potential through the term (when the induced circuit is at rest). The ‘good electromagnetic potentials’ are determined by the Lorenz condition and retarded formulae. Other pairs of potentials derived through appropriate gauge functions are only mathematical devices for calculating the fields; they are not physically related to the sources. The physical meaning of a theoretical term relies, primarily, on theoretical grounds; a theoretical term has a physical meaning if it cannot be withdrawn without reducing the predictive power of a theory or, in a weaker sense, if it cannot be withdrawn without reducing the descriptive proficiency of a theory.