Phys 232

The voltage induced across an inductor as its magnetic field collapses is called ____.

• Counter emf
• Transition voltage
• Reverse voltage
• Counter voltage

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NGSS.HS-PS2-5

In order to induce a voltage across a coil ____.

• The coil must be in motion
• Current must be increasing
• There must be relative motion between the coil and the magnetic field
• The coil must be cut by at least 10^8 lines of force per second

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Lenz's law states that the induced voltage across an inductor ____. 

• Always opposes the current through the inductor
• Always opposes any change in current
• Changes polarity as current changes direction
• Always opposes the applied votage

An inductor ____.

• All of the above

• Provides a specific value of inductance

• Opposes any change in current

• Stores energy in a magnetic field

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NGSS.HS-PS3-2

NGSS.HS-PS3-5

The production of a voltage across an inductor as a result of its own  expanding or contracting magnetic field is called ____.

• Flux density
• Self-inductance
• Counter emf
• Faraday's second law

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NGSS.HS-PS3-5

The most practical way to change the magnetic field of an inductor is to increase or decrease the current through the coil.

• false
• true

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NGSS.HS-PS3-5

the voltage induced across an inductor is inversely proportional to the rate of change of magnetic flux.

• true
• false

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NGSS.HS-PS2-5

The unit of inductance is:

• volt

• Ampere

• Farad

• Henry

An inductor opposes any change in:

• voltage
• current 
• frequency
• reactance

1 Henry is equivalent to

• Weber.Tesla

• V.s/A

• Tesla/s

• Weber.A/s

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