A bar magnet is placed beside a steel bar. Some of the magnetic field lines produced by the magnet are shown. Which poles are correct for the magnet, and would the steel bar attract or repel the bar magnet?
- AX: N pole; Y: S pole; force: attraction
- BX: N pole; Y: S pole; force: repulsion
- CX: S pole; Y: N pole; force: attraction
- DX: S pole; Y: N pole; force: repulsion