ABSTRACT
When students are taught electromagnetism for the first time, it is inevitable that the individual laws such as Coulomb's law, Ampère's circuital law and Faraday's law of electromagnetic induction are introduced separately. As a result, many students tend to think of these laws as describing completely independent phenomena, and very few are aware of even the relative orders of magnitude of the electric and magnetic forces between moving charges, let alone the intimate connection between the electric and magnetic forces between moving charges. This chapter discusses the Coulomb's law and the transformations of the theory of special relativity as axiomatic. It illustrates the unity of electromagnetism in a vivid way, and shows that the theory of classical electromagnetism is consistent with the theory of special relativity. According to the theory of special relativity, the laws of electromagnetism are the same in all inertial reference systems.
