Magnetism and Electromagnetic Induction

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

• Lenz'
• Faraday's
• Ampere's

___ 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

In 1831 who discovered electromagnetic induction?

• Thomas Edison
• Nikola Tesla
• Michael Faraday

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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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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

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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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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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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

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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

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As the north pole of the magnet is moved into the coil, the magnetic flux is _________.

• increasing

• decreasing

• remains constant

• depends on the speed of the magnet

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