I understandthat moving charged particles can be made to rotate in a magnetic feild, but what happens when the induced magnetic field of the current exceeds the containing feild? the situation I am imagining is a beta radiation source ejecting high speed electrons perpendiculat to the feild. if the source was contiually replace then over time you would have a very large amount of high speed electrons, so what happens to the electrons assuming they all have the same velocity. additionally, if the electrons have different velocities and so different orbital radii, what is the effect of the magnetic feilds on each other? I don't know much about this sort of stuff so any constructive criticism (and ofcourse explanations) would be appreciated.