Brainpop Magnetism

How can you create a magnetic field?

• By stringing many magnets together

• By plugging a refrigerator magnet into an electric socket

• By rubbing a piece of glass against a piece of wool

• By running a current through a wire

Where might you find an electromagnet?

• In a fluorescent light bulb

• Hanging on your fridge door

• In an electric motor

• In pieces of rock called magnetite

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What can you conclude about electricity and magnetism from the information presented in the movie?

• They have nothing to do with one another

• They cannot be controlled

• They are related phenomena

• They have no practical applications

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If you have an electromagnet, how can you make its magnetic field stronger?

• Increase the size of the magnetic domains

• Increase the strength of the electrical current

• Increase the length of the wire

• Increase the distance between the north and south poles

Which of the following is a true statement?

• Hans Orsted and Michael Faraday competed to be the first scientist to describe electromagnetic induction

• Orsted and Faraday were colleagues who worked together to discover electromagnetic induction

• Orsted stole Faraday's ideas about electromagnetic induction, leading to controversy

• Faraday built on Orsted's discoveries to describe electromagnetic induction

What is the relationship between electricity and magnetism? Choose the best answer.

• a. Electricity is a form of magnetism.

• b. Magnetism is a form of electricity.

• c. They are two forms of the same basic force.

• d. They are not closely related at all.

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Two electromagnets contain the same types of magnets and wires. But the magnet in the first moves much faster than the second. Therefore:

• The first electromagnet has a more powerful current than the second

• The first electromagnet has a less powerful current than the second

• The currents in the two electromagnets run in opposite directions

• The current in the first electromagnet moves faster than the current in the second electromagnet

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Which of the following devices is most likely to contain an electromagnet?

• gas stove

• flashlight

• digital watch

• refrigerator

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What is a common use of magnets in everyday life?

• A) To hold notes on a refrigerator

• B) To power a car engine

• C) To cook food

• D) To clean windows

Which material is typically not magnetic?

• A) Iron

• B) Nickel

• C) Copper

• D) Cobalt

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