Let's say we have a metal conducting wire with delocalized electrons and positive metal ions. We apply a potential difference across it. Now, the electrons will start flowing in one direction due to the electric field. If we observe from the reference frame of one of the moving electrons, won't the space in the wire between the positive ions be contracted (length contraction) and the density of positive charges would be more than that of negative charges (electrons) from the electron reference frame? Wouldn't this net positive charge attract the electrons moving through the wire?
Also, isn't this what a magnetic field due to moving charges is? (electric field from a different frame of reference). Or is that different..