Exploring Magnets: questions with answers

The observation is that the steel paper clip is attracted towards the magnet. Materials which are attracted towards a magnet are called magnetic materials. Being in water does not change the observation used for this classification.

The observation is that the object is not attracted towards the magnet. Materials attracted towards a magnet are called magnetic materials, so materials not attracted towards a magnet are non-magnetic materials. Being described as a metal object is not enough to call it magnetic.

The marked part is still a piece of a magnet. North and South poles always exist in pairs, so that piece has both North and South poles.

The observation agrees with the rule when most filings are at the poles. The rule says most of the iron filings stick to the poles of a magnet of any shape. Very few at the middle or remaining part does not make the middle the strongest part.

The labels show a piece with only one pole. That is the mistake, because every piece of a magnet has North and South poles together.

A freely suspended magnet comes to rest along the north-south direction. The end that points towards north direction is called the North-seeking pole or the North pole of the magnet.

A magnetic compass has a magnet in the shape of a needle which can rotate freely. The needle indicates the north-south direction. This is connected to the rule that our Earth itself behaves like a giant magnet.

A magnet always has two poles, and they occur in pairs. One end here is the South pole, so the other end of the same magnet is called the North pole.

The rule is that unlike poles attract each other, while like poles repel each other. The marked pole is S and the two magnets show Attraction. So the tested end must be N. The student wrote S, which comes from using the rule the wrong way round.

The two facing surfaces first have the same pole, S-S, so they repel. To bring the magnets into contact, the facing poles should be unlike poles. Turning one ring magnet over can make S-N face each other, and unlike poles attract each other.

The two ends of the same magnet are opposite poles. For attraction, the facing poles are unlike; for repulsion, the facing poles are like. Applying these rules along the chain gives 2-S, 3-S, 4-N, 5-N, 6-S.

A magnet below a cardboard tray can move steel balls on the tray. This uses the observation that magnetic effect can act through non-magnetic materials, so the magnet need not touch the steel balls directly.

The drawing gives an observation: the compass needle remains deflected with no appreciable change after the wood sheet is inserted. This means the sheet did not appreciably change the magnet's effect on the compass needle.

Store bar magnets with unlike poles on the same side, a wooden spacer between them, and soft-iron pieces across both ends. The mismatched feature is Middle spacer.

The storage rule says magnets should be kept in pairs with unlike poles on the same side. A piece of wood should be in between, and two pieces of soft iron should be placed across the ends. The marked part asks for one of these required features.