Maxwell’s equations are a set of four equations that theoretically predict the existence of "electromagnetic waves." Based on theoretical analysis and experimental verification, this study proves that Maxwell’s "displacement current" hypothesis is untrue; that is, a changing electric field in a vacuum cannot induce a magnetic field. Similarly, a changing magnetic field in a vacuum cannot induce an electric field; that is, Faraday’s law of electromagnetic induction is not true in a vacuum. Therefore, there are no "electromagnetic waves" in a vacuum. It is the electric field waves, not the "electromagnetic waves" that achieve wireless communication. Faraday’s law of electromagnetic induction is widely used in metal coils, but it is incomplete in theory. In this study, a magnetic field current and an equipotential metal current ring are proposed, which theoretically perfects Faraday's law of electromagnetic induction. It is also revealed that a transformer, motor, and other components of electrical equipment have the highest electromagnetic energy conversion efficiency when the magnetic circuit and electric circuit are symmetrical. This study summarizes three fundamental laws of electromagnetics: Coulomb’s law, Lorentz’s law of magnetic field induction, and Lorentz’s law of magnetic field force. An electric field, a magnetic field, and a light field are the position characteristic, velocity characteristic, and acceleration characteristic of a charge, respectively. Therefore, the propagation speeds of an electric field, a magnetic field, and a light field in a vacuum are equal, all of them are C, which is self-consistent and reasonable. An electric field, a magnetic field, and a light field cannot induce each other in a vacuum. However, an electric field, a magnetic field, and a light field can be indirectly induced each other with the participation of a charge.