Electromagnetic Review

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

A closed loop through which current can flow is called an ____

• Electric Force

• Electric Current

• Electric Circuit

Which dude discovered that current in a wire caused a

deflection in a magnetic compass?

• Tesla

• Faraday

• Maxwell

• Oersted

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Which area of the bar magnet has the strongest magnetic field effects?

• A (closer field lines near poles = stronger)

• B (Field lines are straighter = stronger)

• C (side of magnet is stronger)

• D (field lines furthest apart = stronger)

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

• True

• False

What kind of magnet can be turned on and off?

• refridgerator magnet
• electromagnet
• magnetite
• iron

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? 

• A. They  can be turned off and on 
• B. Their polarity can be reversed
• C. Their strength can be changed
• D. All of the above

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