Science Quiz - Magnets 01 (Answers)
This KS3 Science quiz is all about magnets. A magnet is a material or object that produces a magnetic field. This magnetic field is invisible but is responsible for a force that pulls on ferromagnetic materials and attracts or repels other magnets. If a material is attracted by a magnet, then it must contain one or more of the elements iron, cobalt or nickel. A magnet has two poles, one is called the north pole and the other is the south pole. If you place two north poles (or two south poles) of magnets near to each other, they will repel, but if you put a north and a south pole together, they will attract.
A magnetic field is strongest close to a magnet and rapidly becomes weaker the further you go from the magnet. You may have used iron filings in your science lessons to see the shape of a magnetic field round a bar magnet. It is difficult to get perfect results, but you should have seen how the lines of magnetism curve round from one pole to the other. When you suspend a magnet in such a way that it can swing around freely, you will find that it ends up pointing towards the north pole and south pole of the Earth. That is because the Earth itself has a magnetic field.
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You can find more about this topic by visiting BBC Bitesize - Magnets and magnetic materials
All magnets are entirely surrounded by their magnetic field
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Magnetic force is strongest at the poles
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Copper objects will therefore not be attracted to a magnet
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Maglev (stands for magnetic levitation) trains use this idea to lift them off the ground
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Opposite poles attract, similar poles repel
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It lines up with the magnetic field of the Earth
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A compass points to magnetic north and not geographical north, so, when using a compass for navigation, the difference in location between the two poles has to be taken into consideration
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The other materials are not affected by a magnetic field
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Steel contains mainly the element iron
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Magnetic force acts at a distance
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