ELECTROMAGNETISM REVIEW

When we bring the magnets closer together when the forces are repulsive, we observe that

• the magnets stick together

• the poles of the magnets switch

• the magnets move away from each other

• the train car slows down

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When the electric current is rapidly switched back and forth in a coil of wire inside a speaker,

• the sound gets louder and softer

• The frequency of the sound goes up and down

• the speaker vibrates and creates sound

• the membrane will stretch

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The area around a magnet is called the .....

• attraction zone

• work area

• magnetic field

• hot zone

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True or False: All metals stick to magnets.

• True
• False

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Every magnet has a:

• East and West pole

• North and South pole

• East and South pole

• North and West pole

• Chicago and Saint pole

The picture is an example of an:

• Electric circuit
• Electromagnet
• Electric nail
• Electric power cell

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These magnetic domains are:

• strongly magnetized

• slightly magnetized

• unmagnetized

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To make this electromagnet stronger you could:

• use less wire

• have fewer wire coils around the nail

• have more wire coils around the nail

• use a plastic core

What is true about electricity and magnetic fields?

• Electricity is needed to create any magnet.
• Electricity always creates a magnetic field.
• Electricity is stronger than a magnetic field.
• Electricity prevents magnetic fields from occurring.

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A compass needle responds to a magnetic field, because the compass needle is a

• A. generator.
• B. motor.   
• C. magnet.
• D. transformer.

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