Electromagnet

What is an electromagnet?

• a temporary magnet made from current carrying wire around a magnetic metal core.
• a permanent magnet with a north and south pole

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This is a picture of a simple electromagnet. How can the electromagnet be made stronger?

• Add more coils of wire to the nail.
• Use a smaller battery.
• Reverse the poles of the magnet.
• Remove all the coils and the nail.

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Which of the following is NOT part of an electromagnet?

• Wire
• Iron
• Toothpick
• Power source

How are electromagnets different from 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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Surrounding every magnet is a __________  __________.

• magnetic field
• electrical current
• another magnet

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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

  You can make an electromagnet stronger by: having a __________________ current in the wire

• smaller
• larger
• greener
• water

The strength of the magnetic field of a electromagnet can be increased by

• Decreasing the number of coils.
• Increasing the number of coils
• Decreasing the current
• Increasing the resistance

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What is the metal center of an electromagnet called?

• The current
• The wire
• The coil
• The ferromagnetic core