A known bar magnet sits on the left. On the right is an unknown bar: it might be another magnet, or it might be an unmagnetised piece of iron. Choose which pole of your magnet faces the unknown, predict the result, then bring them close. Like poles repel and unlike poles attract, but an unmagnetised magnetic material is always attracted. Use that to decide what the unknown really is.
MissionClassify the unknown bar: a magnet, or an unmagnetised magnetic material?Round 1Streak 0Best 0
Predict the result:
Verdict:
pole facing the unknownN
last testnot yet tested
repulsion seen this roundno
Like poles repel, unlike poles attract. Only repulsion proves a magnet.