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Physics - need help please?
Suppose you are given 3 rectangular metal bars of similar appearance and mass, a piece of cotton and a wooden clamp stand. You are told that one bar is a strong magnet, one is an unmagnetised iron bar and the third is a non-magnetic alloy.
Describe an experiment you could carry out to find out which was the bar magnet and how you could identify its poles.
Explain how you would then distinguish between the iron and alloy bars.
If you suspend one piece of metal onto the clamp stand so that it can swing freely, then if none of the other metal bars disturb it in anyway when they are held close to the bar, it must be the non-magnetic alloy.
If you suspend another piece of metal onto the clamp stand and is attracted towards one of the iron bars, then either it is the magnet, or it is the unmagnetised iron bar, depending on whether it moves towards the bar you are holding, or you feel the bar you are holding move towards the suspended bar. In the first case the bar being held is the magnet, in the second the suspended bar is the magnet.
Finally, to determine the poles, you would need to know the direction of magnetic north. The north pole of a freely suspended bar magnet would point in this direction.
[I can't help thinking that there must be an easier way of determining which pole was which, but I can't think of one. If you magnetised the iron bar by stroking it in the same direction with the magnet repeatedly, this would tell you that opposite poles attract while like poles repel each other, but this would not help in identifying which pole was which].
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