This can be experimentally verified.
- Refraction and interference patterns observed in the field of optics can all be explained with a model where energetic photons are larger than less energetic photons.
- Michael Faraday showed in 1845 that magnets polarize light. This supports the idea that magnetism is communicated as spin.
Luckily for us, we know that a photon cannot be deformed in any random way. It cannot be deformed in a way that changes its size, since size is reserved for energy. Also, it cannot be deformed in a way that changes its dielectric quality.
This means that if a photon is dented on one side, it has to bulge out on the other side in order to retain both size and dielectric property.
The electric force is therefore communicated as a dent and bulge in the daisy chain of six charged quanta that makes up the photon.
Note that such a structural deformation has both direction and amplitude. This corresponds to the direction and strength of the electric force. The stronger the electric force, the greater is the deformation. Changing the direction of the electric force, changes the position of the dent and bulge of the photon.
Note also that if the dent and bulge pair are to stay in position while the photon spins, the charged quanta have to carefully coordinate their movements with the magnetic field.
This is doable as long as the photon neither changes its rate of spin nor its direction of spin. However, if the direction or rate of spin changes, the dent and bulge will be displaced.
This means that a magnetic field cannot change either its strength or its orientation without affecting the electric field.
This inability to change a magnetic field without affecting electric fields present in the same space is what joins the electric force to the magnetic force.
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