AP Physics Electromagnetic Induction

AC Generator: As the loop rotates clockwise, it cuts across decreasing number of field lines until it becomes zero when the armature is vertical.

• True

• False

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

• Use a magnet of opposite polarity

• Move the magnet through the coil faster

• Reverse the magnet's direction

• Use a larger magnet

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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

In physics, to "induce" something is to:

• Make it more powerful

• Create it

• Turn it into something else

• Reverse its direction

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

• gas stove

• flashlight

• digital watch

• refrigerator

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What do you need to build a working electric motor?

• An extremely large magnet

• Fuel that can be burned

• A wire that's at least 5 meters long

• A source of electricity

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Electromagnetic induction is change in ___________________.

• surface area

• magnetic poles

• magnetic flux

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