Electromagnet Review

What kind of magnet can be turned on and off?

• refridgerator magnet

• electromagnet

• magnetite

• iron

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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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

Label the parts of the electromagnet.

a

b

c

d

wire

solenoid

voltage source

iron core

Which of these is a way to make an electromagnet stronger?​ ​ ​ ​ (a)  

• wrapping the wire around the iron core more

• putting a switch in the electrical circuit

• replacing the copper wire with plastic wire

• replacing the iron core with a copper core

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Which dude discovered that current in a wire caused a

deflection in a magnetic compass?

• Tesla

• Faraday

• Maxwell

• Oersted

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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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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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What is created around the solonoid?

• Magnetic Field

• Electric Field

• A gravitational field

• Nothing