Electromagnetic Induction

___ 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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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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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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How to increase the induced current?

• Change carbon brush

• Change position of the pole

• Use small scale Galvanometer

• Increase number of coils

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A(n) ___ converts electricity into magnetism.

• electric transformer

• electric generator

• electromagnet

• electric motor

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Which of the following will increase the strength of an electromagnet?

• Use a Bigger Battery (More Current)

• Wrap More Coils

• Insert an Iron Core

• Use a Bigger Magnet

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What must occur for a magnetic field to induce an electric current?

• The magnetic field must be really big

• The magnetic field must be stable

• The magnetic field must be changing

• The magnetic field must be from a permanent magnet

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A(n) ___ electric current will create a changing magnetic field.

• existing

• direct

• alternating

• stable

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