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Magnet Quiz Study Guide
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A magnet is an object that attracts iron or other metallic objects. It is made from metal that is magnetic.
Magnetic things pull – or attract – objects that have iron in them.
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Magnetism is a force in which objects are attracted or repelled to one another.
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All magnets have two ends called poles. One end is the North seeking pole (N) and the other is the southseeking pole (S).
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Two objects attract each other if they pull toward each other. They repel each other if they push away.
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Poles that are the same repel each other, or push each other away. If two N poles are near each other,
they push each other away. Two S poles also push each other away.
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Opposite poles attract each other, or pull toward each other. An N pole and an S pole pull toward each
other.
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The area around a magnet that behaves like a magnet is a magnetic field. The farther apart two magnets
are from one another, the weaker the magnetic field becomes.
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Magnets have many uses, such as keeping doors closed, holding papers on refrigerators, in tools, in some
games, and in machines. Magnetic trains carry passengers on special tracks. Magnets can be used to sort
metals.
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An electromagnet is an object that uses electricity to become magnetic. Electromagnets can be turned
on and off. They are made to pick up iron or steel. Some are used to lift heavy things like old cars.
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You can make an electromagnet by wrapping wire around a screw, then connecting both ends of the wire
to a battery. The electricity from the battery makes the screw a magnet.
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Bar magnets and horseshoe magnets are permanent magnets. They will be magnetic for a long time.
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It is possible to make a magnet by passing on an object close to another magnet. The an object becomes
a temporary magnet. A temporary magnet is a magnet that will only be magnetic for a short time. You can
make a temporary magnet by holding an object like a paper clip next to a magnet. It will then attract
objects made of iron.
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A generator is a machine that uses a magnet to make electricity. Generators are used during power
failures.
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Naturally occurring magnets in nature are called lodestones. They are permanent magnets. The Earth is a
giant magnet.