The transmission of electricity itself generates a magnetic field. for an electron moving in a particular direction, a 90-degree magnetic force is emitted. Try

The transmission of electricity itself generates a magnetic field. for an electron moving in a particular direction, a 90-degree magnetic force is emitted. Try winding some copper around a nail and connecting the wires to a battery. You'll be able to pick up paperclips. Superconductivity allows current levels to get high enough to generate massive magnetic fields so I don't think there's a difference. but then I'm no particle physisict