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It is well established that the photon is the propagator for the electromagnetic force. How are the set of photons used in the H-field behaving differently than those in the E-field? Is it different when dealing with an electromagnet versus an intrinsic magnet?

In what way do the photons need to be emitted by a bar magnet to result in a magnetic interaction? How about a charged object to interact with a charged object?

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The virtual photons that represent the static Coulomb potential, so the electric field, have time polarisation and those representing the static vector potential, so the magnetic field, have spatial polarisation.

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  • $\begingroup$ Thanks! Still a bit unclear. Do you have a reference for this so I can look more into it? $\endgroup$ – Finesagan Aug 24 '18 at 23:37
  • $\begingroup$ The so called off the mass shell virtual photons are just the Fourier components of the potential. For a static electric field this is the Coulomb potential $A^0$ and for a static magnetic field the vector potential $\vec A$. This leads you to my answer.@finesagan $\endgroup$ – my2cts Aug 27 '18 at 15:58

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