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While electric current is flowing through a wire, what surrounds the wire?

• a magnetic field
• a glowing light
• neutrons
• protons

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What would increase the strength of an electromagnet?

• Increasing the amount of current flowing through the wire.

• Inserting a wooden core inside the coil

• Changing the direction of the current

• Decreasing the number of coils of wire

What must the student do in the picture, in order to induce electricity and move the the galvonometer

• nothing

• move the magnet

• add more loops of wire

• unplug the galvnonmeter

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What happens to the strength of an electromagnet as you add more coils around it?

• Increases
• Decreases
• Stays the same
• Stops completely

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What can you do to make electromagnets stronger?

• Increase number of coils of wire.

• Increase number of batteries used.

• Both A and B.

• Neither A nor B.

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Surrounding every magnet is a __________  __________.

• magnetic field
• electrical current
• another magnet
• an enemy

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How are electromagnets different from permanent magnets?

• magnets can be turned on/off

• you can turn an electromagnet on/off

• magnets are more powerful

• magnets have a North and South pole

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What is the device seen here?

• generator
• electric motor
• electromagnet
• magnet

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Why did this simple electric motor work?

• The current from the battery induces a magnetic field in the copper loop, turning it into an electromagnet that repels from/attracts to the permanent magnet

• The electromagnet on top of the battery pulls on the magnetic copper wire

• The magnet induces a current in the copper loop which makes it rotate.

• The magnetic field from the battery induces an electric current in the copper loop, turning it into an electromagnet that repels from/attracts to the permanent magnet

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What is created when a magnet moves through a coil of wire?

• A. an electromagnet
• B. a ferromagnet
• C. a solenoid
• D. an electric current

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