• #### 1.  Which description best applies to Lenz's Law?

• An induced current occurs when a magnet passes through a tube.
• When a change in magnetic field occurs to a coil the direction of current goes in the in the other direction to this change.
• The direction of an induced current is such to align with the change that created it.
• A magnet is a tube is always slowed by its magnetic field.
• #### 2.  What benefit is gained by the addition of the iron core in an electromagnet?

• It makes a strong magnet weaker
• It makes a weak magnet stronger
• There is no benefit at all
• It lets currents interact with each other
• #### 3.  Electromagnetic induction is taking place in this experiment. How much electricity is being produced?

• -10 Volts
• 10 Volts
• 100 Volts
• This question cannot be answered based on this image
• #### 4.  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

• Lenz'
• Ampere's
• #### 6.  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

• doubles
• is the same
• halves
• #### 8.  Electromagnetic induction is change in ___________________.

• surface area
• magnetic poles
• magnetic flux
• #### 9.  How could the experimenter increase the amount of electricity being induced by this experiment?

• Increase the number of coils
• Decrease the number of coils
• Flip the magnet around
• Nothing, the amount of electricity cannot be increased
• #### 10.  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
• #### 11.  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
• #### 12.  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

• Generator
• Motor
• Magnet
• Transformer
• #### 14.  What happens to the galvanometer if the copper rod is moved upwards?

• No change
• Deflect to the right
• Deflect to the left
• Deflect to the right and left
• #### 15.  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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