Faraday's Law

Faraday’s law states that an induced emf is proportional to

• The rate of change of the magnetic field

• the rate of change of the electric field

• the rate of change of the magnetic flux

• the rate of change of the electric flux

If the magnetic flux through a certain region is changing with time:

• energy must be dissipated as heat

• an electric field must exist at the boundary

• a current must flow around the boundary

• an emf must exist around the boundary

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NGSS.HS-PS2-5

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As an externally generated magnetic field through a certain conducting loop increases in magnitude,the field produced at points inside the loop by the current induced in the loop must be:

• increasing in magnitude

• decreasing in magnitude

• increasing in magnitude

• . directed opposite to the applied field

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NGSS.HS-PS2-5

A magnet can move in a coil of wire to produce electricity in which system?

• Generator
• Motor
• Magnet
• Transformer

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NGSS.HS-PS2-5

Which activity will produce the highest current?

• Move the magnet bar into the coil while the coil remains stationery

• Move the coil into the magnet bar while the magnet remains stationery

• Move the coil and magnet towards each other

• Move the coil and magnet away from each other

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NGSS.HS-PS2-5

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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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NGSS.HS-PS2-5

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What is one way to increase the current in a wire?

• Decrease the number of coils
• Increase the number of coils
• Move the magnet slower
• Take the wire off of the magnet

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NGSS.HS-PS2-5

• A

• B

• C

• D

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NGSS.HS-PS3-5

• 0.4 volt

• -0.4 volt

• -2 volt

• 2 volt

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• 1 volt

• 5 volt

• 50 volt

• zero volt

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NGSS.HS-PS3-5