电磁场组成一个二阶反对称的四维张量,是一个统一的不可分割的整体。然而,这是否意味着电场和磁场的划分完全是相对的,二者可以无条件的相互转化呢?这是初学相对论的学生容易混淆的问题。“费曼物理学讲义”上的一个例题也往往使读者产生这样的疑问。 Electromagnetic field to form a second-order antisymmetric four-dimensional tensor, is a unified indivisible whole. However, does this mean that the division of electric and magnetic fields is completely relative and that the two can be transformed unconditionally? This is a confusing issue for beginner relativistic students. An example from “Feynman’s Handbook of Physics” also often leads readers to this question.