Faraday's Law

The essential concept in an electric motor and a generator is

• Coulomb’s law

• Ohm’s law

• Faraday’s law

• Newton’s second law

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If a wire is moved perpendicular to the magnetic field, what is induced

across the ends of the wire?

• area

• coil

• magnetic field

• potential difference

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A voltage will be induced in a wire loop when the magnetic field within

that loop

• changes

• aligns with the electric field

• is at the right angle to the electric field

• converts to magnetic energy

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If you change the magnetic field in a closed loop of wire, you induce

in the loop a

• current

• voltage

• electric field

• all of the above

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What is electromagnetic induction?

• The production of an electric current created by a varying magnetic

  field

• The production of the magnetic field, accomplished by running a

  current through a coil of wire

• Creating electromagnetic fields by any purposeful means

• Building a magnet

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Which of the following is NOT a way that a magnetic field can be varied to induce a current in a wire?

• Move the coil in and out of the magnetic field

• Rotate the coil inside the magnetic field

• Move the coil once it is already fully inside the magnetic field

• Change the strength of the magnetic field

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Which of the following would not increase the emf produced by a generator?

• rotating the generator coil faster

• increasing the strength of the generator magnets

• increasing the number of turns of wire in the coil

• reducing the cross-sectional area of the coil

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___________ law says that the Induced current is proportional to the change of

magnetic flux.

• Lenz's

• Ampere's

• Biot Savart's

• Faraday's

What would happen if I move a bar magnet in and out of a coil of copper wire?

• Electric current would disappear

• It would produce a gravitational field

• Electric current will flow through the wire

• The magnet would explode

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Electromagnetic induction is change in ___________________.

• Surface Area

• Magnetic Flux

• Magnetic Poles

• Electric Field