Faraday and Lenz

Electromagnetic induction is change in ___________________.

• surface area

• magnetic poles

• magnetic flux

Voltage can be induced in a wire by

• a. moving the wire near a magnet.

• b. moving a magnet near the wire.

• c. changing the current in a nearby wire.

• d. all of these

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What would happen if I move a bar magnet in and out of a coil of copper wire?

• Electric current would disappear 

• The magnet would explode 

• Electric current will flow through the wire

• It would produce a gravitational field

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Law says that the Induced current is proportional to the change of magnetic flux 

• Lenz'

• Faraday's

• Ampere's

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In 1831 who discovered electromagnetic induction?

• Thomas Edison

• Nikola Tesla

• Michael Faraday

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Which action will increase the deflection of the galvanometer pointer?

• The magnetic pole is reversed

• The number of turns of coils is increased

• The coil is made from insulated wire

• The magnet is slowly pushed into the coil

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NGSS.HS-PS3-5

The voltmeter is at 0 in this image. How would you manipulate the experiment to create electricity (measured in volts)?

• Flip the magnet around so the North pole is facing out

• Move the magnet back and forth

• Take the magnet out

• Add more coils around the paper cylinder

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Which law states that the direction of induced current is such that it opposes the change in magnetic flux that produced it?

• Faraday's Law

• Lenz's Law

• Ohm's Law

• Ampere's Law

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What is the principle behind the working of an electric generator?

• Lenz's Law

• Faraday's Law of Electromagnetic Induction

• Newton's Third Law

• Coulomb's Law

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NGSS.HS-PS3-5

In an experiment, a coil is moved rapidly towards a stationary magnet. What is observed?

• No current is induced in the coil

• A current is induced in the coil

• The coil gets magnetized permanently

• The magnet loses its magnetism

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