Electromagnetism and Materials

This paper first discusses the basic concepts and interrelations of the independent dimensions among field, energy and mass. The basic concepts of magnetic field, electric field and electromagnetic wave are also summarized with common application technologies. Finally, unlike the theory of relativity which introduces time variable into multi-dimensional coordinates, this paper introduces the four-dimensional variables based on the theory in space topology, which discusses the field of the fourth-dimensional parallel space based on the symmetry of the magnetic field and the electric field, and incorporates the original bio-electromagnetic wave theory into the study of electromagnetic theory, filling in the research gap which has not been covered in the previous textbooks.