The extent of their deflections will then depend on their accelerations, which in turn depend on their respective masses. The least massive nuclei will be deflected the most and the most massive nuclei will be deflected least. A habitat in space could be shielded from cosmic radiation if a magnetic field were set up about the habitat, just as the magnetic field of the earth shields us from much of the cosmic radiation that would otherwise strike the earth. Magnetic levitation will reduce surface friction to near zero. Then only air friction will remain.
Air friction gets rapidly larger as speed increases.
Yes, each will experience forces because each is in the magnetic field of the other. Interestingly, currents in the same direction attract, and currents in opposite directions repel.