Lesson

Which zone of inhibition is the smallest?

• A

• B

• C

• D

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What kind of magnet can be turned on and off?

• refrigerator magnet

• electromagnet

• magnetite

• iron

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If you wrap more coils around an electromagnet, it will become 

• brighter

• stronger

• weaker

• invisible

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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

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When running a current through a wire, what do the blue lines represent?

• The wire spinning

• A magnetic field that was created

• Electrons leaving

• Electricity

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The picture is an example of an:

• Electric circuit

• Electromagnet

• Electric nail

• Electric power cell

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Electric current flowing through a wire produces

• static electricity

• an open circuit

• a permanent magnet

• a magnetic field

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Increasing the number of coils in an electromagnet will _________ the power of the magnet.

• decrease

• increase

• not affect

What are balanced forces?

• Forces that are equal in size but act in the same direction

• Forces that are equal in size but act in opposite directions

• Forces that are unequal in size and act in opposite directions

• Forces that are unequal in size and act in the same direction

What are unbalanced forces?

• Forces that are equal in size but act in opposite directions

• Forces that are not equal to one another

• A push or a pull that causes an object to change its motion

• Something that remains constant in an investigation

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