Magnetism Vocabulary

Which of the following is true of all magnets?

• They are man-made.

• They are made of iron.

• They have two poles and a magnetic field.

• They are magnetic only when an electric charge goes through them.

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If you have two magnets and you try to put the two north poles together, what will most likely happen?

• The two poles will not touch each other because of magnetic repulsion.

• The magnets will stick together because of magnetic attraction.

• The two poles will touch but not stick together.

• The magnets will lose their magnetism.

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Which of the following objects has polarity?

• the Earth, which has magnetic north and south poles

• the city of Chicago, which has a North and South side

• a map of the country, which has a compass pointing north

• an unmagnetized block of metal, which has a top and a bottom

A magnetic field is

• something used to demagnetize pieces of metal.

• the area in which a magnet exerts magnetic force.

• an open area where you are likely to find natural magnets.

• an electric charge that can be sent through a wire to make it magnetic.

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True or False: Man-made magnets always retain their magnetism.

• True

• Flase

Which of the following works because of the Earth’s magnetism?

• a compass

• a maglev train

• an electric lock

• a computer chip

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Magnetic attraction is a property that makes two magnets stick together. It occurs when

• a magnet is near a nonmagnetic object.

• two magnets’ south poles are near each other.

• opposite poles of two magnets are near each other.

• a natural magnet and a man-made magnet are near each other.

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Magnets are a mystery to scientists because scientists

• don’t know how to tell the north pole from the south pole.

• can’t tell how much magnetic force a magnet has.

• don’t know why magnets have magnetic force.

• don’t know why the Earth has magnetism.

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Each of the following is an example of how magnets are used except

• storing information on computer hard drives

• sticking photos on the refrigerator

• making high speed trains levitate

• locking padlocks with metal keys

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The ancient Greeks found some metallic rocks that attracted other metallic objects. They called them lodestones. A lodestone is an example of

• a north pole

• a natural magnet

• a man-made magnet

• a non-metallic magnet