magnetism

An electromagnet is ____________

• lasting, existing, serving, or effective for a time only

• Temporary

• turned on and off

• Permernant

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How is Earth's magnetic field similar to that of a magnet?

• It is shaped like a sphere

• It is hundreds of miles long

• It has North and South poles

• It is shaped like a horseshoe

_{^{The magnet's shown will}}

• not move
• attract
• repel
• all of the above

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An example of the materials that attracted to magnets is

• 
• 
• 

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Atoms are made up of

• Protons

• Neutrons

• Electrons

• All of the above

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What are the differences between an Electromagnet and a Permanent Magnet?

• A permanent magnet stays a magnet forever and a Electromagnet doesn't.

• An Electromagnet need electricity and a permanent magnet doesn't

• Electromagnets are less useful.

• electromagnets are temporary

• You can change the power of the permanent magnet but not an electromagnet.

What kind of magnet can be turned on and off?

• refridgerator magnet

• electromagnet

• An original magnet

• iron

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The pole that attracts north pole and repels south pole

• north pole

• south pole

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A magnet that loses all or most of their magnetic strength quickly

• permanent magnet

• temporary magnet

• superconductor

• electromagnet

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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