Magnetism and Electromagnetism Review

What kind of magnet can be turned on and off?

• refridgerator magnet

• electromagnet

• magnetite

• iron

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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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How do electromagnets differ from regular magnets? 

• They  can be turned off and on 

• Their polarity can be reversed

• Their strength can be changed

• All of the above

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What does magnets repelling mean?

• Magnets move away from each other

• Magnets do not have magnetism

• Magnets move towards each other

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Electromagnetism is a magnetism produced by an electric current.

• True

• False

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Electric current can flow through a wire only if it forms a ____

• Open Loop

• Closed Loop

True or false: Sometimes magnets break into pieces that only show magnetism on one side (which is called a monopole).

• True

• False

Permanent Magnets and Electromagnets are similar in which TWO ways?

• it can be turned off and on

• they both have a north and south pole

• they are surrounded by a magnetic field

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Magnetic field lines around a bar magnet:

• are only perpendicular to the magnet

• spread out from one pole and curve around to the other

• cross back and forth over one another

• are perfectly straight

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Every magnet, regardless of its shape, has two:

• magnetic poles

• magnetic charges

• magnetic fields

• magnetic needles