Electromagnets

Which of the following is a true statement?

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

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

• c. Orsted stole Faraday's ideas about electromagnetic induction, leading to controversy d. Faraday built on Orsted's discoveries to describe electromagnetic induction

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

When an electric current runs through a wire, a magnetic field is induced …

• a. Around the wire

• b. Parallel to the wire

• c. Under the wire

• d. through the wire

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3. In physics, to "induce" something is to:

• a. Make it more powerful

• b. Create it

• c. Turn it into something else

• d. Reverse its direction

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

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

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

• c. The currents in the two electromagnets run in opposite directions

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

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

• gas stove

• flashlight

• digital watch

• refrigerator

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7. You're going camping, and you need a source of electric current. So, you buy a gasoline-powered:

• a. Motor

• b. Generator

• c. Inducer

• d. Electromagnet

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8. What do you need to build a working electric motor?

• a. An extremely large magnet

• b. Fuel that can be burned

• c. A wire that's at least 5 meters long

• d. A source of electricity

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What might happen if transformers didn't exist?

• a. The electricity in your house might have an extremely high voltage

• b. Electricity could not be distributed through power lines to people's homes

• c. Electricity could not be created at power plants

• d. The direction of the electric current in your home might switch back and forth

10. How would you reverse the direction of the current flowing through the coil in Faraday's experiment?

• a. Use a magnet of opposite polarity

• b. Move the magnet through the coil faster

• c. Reverse the magnet's direction

• d. Use a larger magnet

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