Magnetic Forces

To force something to move away or apart.

• repel

• attract

• charge

• pull

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An area where magnetic materials are attracted or repelled by the magnet.

• corn field

• magnetic field

• electromagnetic

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A temporary magnet with a magnetic field produced by electric current.

• electromagnetic

• magnetic strength

• electric charge

• shock

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What tells us how strong a magnet is?

• magnetic strength

• charged particle

• magnetic field

• current

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This word means "pull together"

• attract

• repel

• neutral

• current

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Frederick sets paper clips out on a table. He then takes a magnet, places it directly beneath the paper clips under the table, and moves the magnet. He finds that the paper clips move with the magnet. Why does this happen?

• Magnetic force is a repellant force

• Magnetic forces act on wood, like in the table

• The paper clips are feeling the gravitational force of the magnet

• Magnetic forces act at a distance, even betwewn objects

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Two bar magnets are held close together. They are released and allowed to move freely. The bar magnets quickly come together. Which best explains why this happens?

• The poles facing one another are both south poles

• The poles facing one another are both north poles

• The poles facing one another are opposite poles

• One magnet was bigger than the other

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In an electromagnet, coils of wire are wrapped around a magnetic object to generate a magnetic field. What the is relationship between number of coils and the strength of the magnetic field?

• The more coils an electromagntic has, the stronger the magnetic field

• The more coils an electromagntic has, the weaker the magnetic field

• The larger the metal object, the stronger the magnetic field is

• There is no relationship between number of coils and the strength of a magnetic field

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Surrounding each magnetic is an invisible force field called

• Gravity

• A magnetic field

• An electric field

• The Force

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To decrease the strength of a magnetic field around an electromagnet, we must

• increase the number of coils

• increase the size of the iron core

• decrease the size of the iron core

• decrease the number of coils