Magnets

How can the strength of an electromagnet be increased? (mark all that apply)

• increase the current flowing through the coil

• increase the number of coils

• add an amplifier to it

• put iron core inside the coil

What’s the most important function of Earth’s magnetic field?

• Earth's magnetic shield deflects asteroids and meteors

• Earth's magnetic shield keeps energy from escaping into space

• Earth's magnetic shield deflects most of the solar wind

• Earth's magnetic shield helps birds and other animals navigate

Which of the following materials will be attached to a magnet?

• Gold

• Silver

• Copper

• Iron

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To which of the following purposes would a magnet be best suited?

• Heating the water in a pot

• Sorting a mixture of iron shavings and black pepper

• Powering an electronic device

• Conducting electrical charge

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For which of the following reasons do magnets usually stick to a refrigerator door?

• The door has electric wires in it

• The door is smooth

• The door contains iron

• The door is a good conductor

True or False: A magnet is an object that attracts certain materials such as iron.

• TRUE

• FALSE

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Do all magnets have a north and south pole?

• YES

• NO

The north and south poles of two magnets will _______ each other.

• attract

• repel

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True or false: You can make a permanent magnet from an iron nail by rubbing it with a bar magnet.

• TRUE

• FALSE

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_________ is the ability of a material to be attracted by a magnet and to act as a magnet.

• Magnetism

• Electromagnetism

• Magnetic domains

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