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Electrodynamics is believed to be the best theory of classical physics. It contains three parts: electromagnetic theory, electromagnetic wave theory and special relativity. The first and the second parts belong to classical physics and the third part belongs to modern physics. As we discussed before that both electromagnetic theory and electromagnetic wave theory are based on the incorrect definition of electric and magnetic fields, therefore, they have to be replaced by entity field electromagnetic theory and entity field electromagnetic wave theory. From the correct definition of entity electric and magnetic fields, we can understand that entity magnetic field is the reason of special relativity.
The whole electrodynamics is started from the definition of electric force F. The purpose of this definition is to introduce the definition of electric field E. Unfortunately the so defined E is representing electric force field and is believed to be electric field by mistake. By doing so, electrodynamics failed to recognize the real source of electric force F. As we discussed in entity field electromagnetism, the source of an electric force is unit entity electric field, which forms part of an electron. To avoid confusion, we have to rename the E as electric action. Based on the entity electric field, its force F and its electric action E, an entity field electric theory can be rebuilt as part of entity field electrodynamics.
Comparing with electrodynamics, entity field electrodynamics has the same structure but with entity meaning. For example, if we think an electric charge to be a small particle with excessive electrons, the content within the charge is different from which outside the charge. Within the charge, there are excessive entity electric fields due to the excessive electrons but no electric force and its force field. On the other hand, there is no entity electric field but an electric force and its force field outside the charge. This is why the d function has to be used to deal with this kind of situation.
Similarly, electrodynamics failed to recognize the existence of entity magnetic field. It also mixed the concept of magnetic force field with the concept of magnetic field. After introducing entity magnetic field as the source of magnetic force, an entity magnetic theory can be rebuilt to replace the related part of classical electrodynamics. This entity magnetic field stored in a moving electron as virtual photon and can be released as a photon carries electromagnetic wave.
Since a moving electron has particle, entity electric field and entity magnetic field in its structure, it is a particle carries electromagnetic wave.
Since the entity magnetic field is a relative, relativistic and quantified field, it provides direct links to special relativity and quantum-mechanics.
Like wave optics, Electromagnetic wave theory of electrodynamics does not take entity and special relativity into consideration, so it is a theory that full of mistakes. In fact, an electromagnetic wave is the property wave of a photon, so, photon can’t be separated from its wave. Entity filed optics is the only correct theory about photon and its electromagnetic wave. Since we have just discussed entity field optics in full details, there is no need to repeat is again here.
Although special relativity is included in electrodynamics, it is a modern theory based on the principles of relativity. There is no direct link between classical physics and special relativity since classical physics ignored the existence of entity magnetic field.
An entity magnetic field is created by a moving entity electric field. Both entity magnetic field and entity electric field, along with its particle, are the building materials of a moving electron. Since an entity magnetic field is related to the motion of an electron, it is a relative and relativistic field.
A moving electron is in a stationary state if the reference frame is moving with it. For this reason, we can not detect any entity magnetic field if an electron is stationary in a frames of reference. In other words: “The same laws of electrodynamics and optics are valid for all frames of reference for which the equations of mechanics hold good” – the first principle of special relativity.
A stationary electron has an entity electric field and a particle in its structure, so it is in the basic energy level. A moving electron has an entity electric field, an entity magnetic field and a particle in its structure, so it is in a higher energy lever. An observer who moves along with the moving electron can only detect an entity electric field and a particle in the structure of the electron, for he is in the same higher energy level. When checking light speed in empty space from each energy level, we can only get the same speed c due to the effect of entity magnetic field in the higher energy level. In other words: “Light is always propagated in empty space with a definite velocity c which is independent of the state of motion of the emitting body” – the second principle of special relativity.
If two frames of reference have relative motion, they are in two different energy levels. An electron needs to be accelerated so that to change it from a lower energy level to a higher energy level; it needs to be decelerated so that to change it from a higher energy level to a lower energy level. If twin brothers traveling in different speed, the one traveling in a higher energy level will become younger for he carries more entity magnetic field.