Say you have a current set up in the plane of this page going to the right in a long straight wire (horizontal.) When I say current to the right I am not going by the standard but rather saying that the electrons are moving to the right. Not "positive" charged particles. The electric field magnitude around the wire could then be defined as B = Ui/(2PIr) where r is the radial distance from the wire. Now have an electron going to the right also, at the same rate as the current. Its velocity is parallel to the current. By F = qV x B, the electron should experience a force of qVB where its direction should be towards the current carrying wire. V is defined as the velocity relative to the wire material, or the protons in the wire, if you will. Now remove the wire and thus the protons leaving only the flow of electrons. Also remove all other electrons leaving one. There is now only two electrons moving to the right, one from the original wire and one being the other electron with velocity V. Should the electron now experience a force? It seems as if it would be no because now neither have a velocity relative to each other. It is simply two particles side by side. So this leads me to ask, does the magnetic field generated also depend on the other attributes? Like, protons or possibly even neutrons? Otherwise, I can't seem to differentiate these two scenarios and they seem to disagree. Maybe my reasoning is flawed?