How can you determine the poles of an UN marked magnet?

To determine the poles of an unmarked magnet, you can use a known magnet or a compass. Bring the compass close to the magnet; the compass needle will point towards the magnet's south pole, as it is attracted to the north pole of the compass. Alternatively, you can use another magnet: the north pole of the second magnet will be attracted to the south pole of the unmarked magnet and repelled by its north pole. This interaction can help you identify the poles of the unmarked magnet.