Know It All Friday - 8th Science - 11/20/20

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

• It's shaped like a horseshoe.
• It has north and south poles.
• It is made plastic.
• It is hundreds of miles long.

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Earth acts like a giant magnet because its center is made up MOSTLY of

• granite
• limestone
• iron
• nickel

Where are the magnetic force the strongest in this picture?

• Location 1
• Location 2
• Location 3
• Location 4

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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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In order for an electromagnet to be formed, an __________ current must pass through a coil of __________ wrapped around an ________ core.

• wire, iron, electric
• electric, wire, iron
• iron, electric, wire
• excited, hair, apple

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Electric currents produce _____________

• electron clouds

• magnetic fields

• sound waves

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What kind of magnet can be turned on and off?

• refridgerator magnet
• electromagnet
• magnetite
• iron

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What would happen if you took one end of the wire off the battery?

• The nail will be a magnet.

• The nail would no longer be a magnet

• Nothing will happened.

• The nail will heats up.

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Which electromagnetic waves are used in ovens and cell phone communications?

• Infrared rays
• ultraviolet rays
• microwaves

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Which electromagnetic waves help doctors detect broken bones inside your body?

• gamma rays
• x-rays
• ultraviolet rays

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