Lenz Law

According to Lenz’s law the direction of an induced current in a conductor will be that which tends to produce which of the following effects?

• enhance the effect which produces it

• produce a greater heating effect

• produce the greatest voltage

• oppose the effect which produces it

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NGSS.HS-PS2-5

NGSS.HS-PS3-5

The figure shows a bar magnet moving vertically upward toward a horizontal coil. The poles of the bar magnets are labeled X and Y. As the bar magnet approaches the coil it induces an electric current in the direction indicated on the figure (counter- clockwise as viewed from above). What are the correct polarities of the magnet?

• X is a north pole,Y is a south pole

• X is a south pole,Y is a north pole

• Both X and Y are north poles

• Both X and Y are south poles

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NGSS.HS-PS2-5

Determine the direction of induced current if the magnetic field is increasing.

• Clockwise

• Counter clockwise

• No induced current

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NGSS.HS-PS2-5

NGSS.HS-PS3-5

Determine the direction of induced current if the magnetic field is decreasing.

• Clockwise

• Counter clockwise

• No induced current

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NGSS.HS-PS2-5

NGSS.HS-PS3-5

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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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

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

• Lenz'
• Faraday's
• Ampere's

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NGSS.HS-PS2-5

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-PS2-5

NGSS.HS-PS3-5