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Electromagnetism, is the effect we have when we unify the electric and magnetic forces. In effect, the electromagnetic force field that is homogeneous to every corner of the universe, allows for electomagnetic interactions to occur, exchanged by their correct particle mediators. An electromagnetic waves are also particles - [the massless exitations of the electromagnetic field in the form of deadly gamma photons (also known as photons, and the other classes, such as th Z boson]. In special cases, the gravitational field in conjecture to the electromagnetic force can give rise to a peculiar exitation of gravitationally-stressed regions called graviphotons, which are indestinguishable from the quanta of photons.
We speak of electromagnetism when describing electric and magnetic phenomena because where you find one you will always find the other in equal proportions. The static fields of each of these come from the changing fields of the other. There can exist a static local field, such as a magnet. It is produced by the hidden changing electric fields within the elements in the magnet. When these changing fields are let loose in empty space, their effects always ripple through space, one creating the other. As far as we know, the effect will move through space forever. I suspect that there is one equation, very similar to those of Maxwell, that when applied to adjacent points in space, could describe this effect completely. All of reality could then be described in terms of this equation.
so can we call electromagnetic particles ?or just as Planck says "Quanta"
The W and Z bosons are Quantum Theory concepts within Quantum Electro Dynamics and Quantum Chroma Dynamics. They are considered as sub components of Quarks. They have never been observed just as Quarks have never been observed. Quarks, according to theory, can not exist outside an atomic nuclei.
We have to be careful about mixing theories. String has its own adherents. They try and expand upon Quantum theory. When developing a new theory, there is no need to include past theories; only the observations that led to them need be considered.
''Finally, in 1983, after innovations in accelerator physics at CERN, two experiments were able to directly observe the decay of the W boson, and Carlo Rubbia and Simon van der Meer received the Nobel Prize for the accelerator and experiment.''
We need to not stray too far from the simplicity of electric and magnetic change. An electron is a charged particle. When it moves, its field moves along with it.
What is difference between Electromagnetism and Electromagnetic wave ?
1: magnetism developed by a current of electricity2 a: a fundamental physical force that is responsible for interactions between charged particles which occur because of their charge and for the emission and absorption of photons, that is about a hundredth the strength of the strong force, and that extends over infinite distances but is dominant over atomic and molecular distances —called also electromagnetic force — compare gravity 3a(2), strong force, weak force b : a branch of physical science that deals with the physical relations between electricity and magnetism
We speak of electromagnetism when describing electric and magnetic phenomena because where you find one you will always find the other in equal proportions.
The static fields of each of these come from the changing fields of the other.