Faraday's Law-12.51 FA

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

• Lenz'
• Faraday's
• Ampere's

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Can you produce current in a wire with a magnet that is sitting still?

• Yes; having a magnet near a wire is enough to excite the electrons

• No; the magnetic field has to be changing to excite the electrons

• No; magnets cannot create electricity

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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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What is the direction of the induced magnetic field?

• Left
• Right
• Up
• Down

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What is the direction of the induced magnetic field?

• Left
• Right
• Up
• Down

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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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If you wrap more coils around an electromagnet, it will become...

• brighter
• stronger
• weaker
• invisible

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A coil of wire of 10 turns has across sectional area of 0.08 m2. A magnetic field of 0.4T passes through the coil perpendicular to the plane of the coil. What is the total magnetic flux through the coil?

• 0 Wb

• 0.16 wb

• 0.27 Wb

• 0.32 Wb

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