Is that true? A superconductor magnet needs to be cooled down to temperature (say 4K), but does it generate heat once operating? Seems like heat would come from resistance in the coil, but this resistance is zero when at operating temperature.
Edit: the permanent magnet will feel a force applied against it in the opposite direction, of course. In space, that's have to be countered by rockets though, not electrically in the current running through the superconductor, right?
Because the incoming electrically charged particle induces current in the coils of the electromagnet.
A permanent magnet does not have to deal with that - even if there is current it doesn't affect the magnetism in a permanent way.
Think about an electric solenoid: A stationary electromagnet does not consume power, a moving one does as it acts on the external magnets.