A bar magnet has no markings to indicate its poles. How would you find out near which end is its north pole located?

1. Magnet Interaction: Use another magnet; the north pole of the bar magnet attracts the south pole of the known magnet and repels its north pole.
2. Compass Test: Place a compass near the bar magnet; the end that attracts the north-seeking needle is the south pole, making the other end the north pole.