Magnet Interactions

A magnetic field is...

• the ability to draw closer to an object.

• the magnetized region of space around a magnet.

• a device with a magnetized needle.

• when a magnet always maintains its magnetic properties.

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a permanent magnet is

• a device with a magnetized needle for finding directions.

• a magnet that has magnetic properties for a limited time.

• a magnet that always maintains its magnetic properties.

• a piece of metal that attracts metal

a temporary magnet is

• a device that has a core that is temporarily magnetized by the flow of electric current through a coil that surrounds it.

• a device that has magnetic properties for a limited time.

• a device with a magnetized outer core.

• a device that always maintains its magnetic properties.

Magnetic force is

• the ability to attract iron or steel objects.

• the ability to push or pull objects made of iron, cobolt or nickel.

• a piece of metal that attracts other metal

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Which is an example of how magnets can help at home?

• lifting then dropping metal washers.

• a crane lifting a car to be crushed.

• separating aluminum cans from glass

• closing a refrigerator door.

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What must happen for an electromagnet to have a magnetic field?

• It must be heated

• It must touch another magnet

• It must line up with the Earth's magnetic field

• It must be connected to electricity.

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The fact that a compass needle always points north tells us what?

• the solar rays affect magnetism.

• most compasses need to be set

• earth is surrounded by a magnetic field

• there is static electricity in the air.

How would you explain to your friend how Earth's magnetic field is similar to a bar magnets? magnetic field?

• a bar magnet and the Earth are both round

• a bar magnet is magnetic in the middle like the Earth

• A bar magnet and the Earth are both cylindrical

• A bar magnet is magnetic at the poles like the Earth.

What is our best evidence that Earth has a magnetic field?

• All things fall toward the center

• A compass needle lines up with it

• The wind blows from east to west

• Earth's oceans all have currents.

True or False: All metals stick to magnets.

• True

• False

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