Faraday's and Lenz's 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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___ Law says that the Induced current is proportional to the change of magnetic flux 

• Lenz'
• Faraday's
• Ampere's

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___ Law says that a current produced by an induced emf moves in a direction so that its magnetic field opposes the original change in flux

• Lenz'
• Faraday's
• Ampere's

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 Faraday's Law states that the induced emf is proportional to Hide answers

• the current 
• the cross sectional area of the coil 
• the rate of change in the flux of the coil

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13.2 If a magnet is pushed into a coil, voltage is induced across the coil. If the same magnet is pushed
into a coil with twice the number of loops,

• a. one-half as much voltage is induced.
• b. the same voltage is induced.
• c. twice as much voltage is induced.
• d. four times as much voltage is induced.

A coil spins in a magnetic field. Of the following

which causes an increase in the induced EMF in

the coil?

• Spinning the coil faster

• Removing the coil from the magnetic field

• Keeping the flux at a constant rate

• Decreasing the number of turns of wire in

  the coil

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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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In what direction is the magnet moving?

• Left
• Right
• Up
• Down

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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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