Faraday

A flat coil consists of 20 turns each of area

an area of 50 cm2, is positioned perpendicularly to a uniform magnetic field that increases its magnitude at a constant rate from 2.0 T to 6.0 T in 2.0 s. If the coil has a total resistance of 0.40 ohms , what is the magnitude of the induced current?

• 70 mA

• 140 mA

• 500 mA

• 800 mA

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A coil in a magnetic field encloses a flux of 0.256 Tm² when the angle between the normal to the coil and the direction of the magnetic field is 70.0°. What flux would go through the coil if the angle were changed to 40.0°?

• 0.332 T·m²

• 0.198 T·m²

• 0.114 T·m²

• 0.573 T·m²

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In what direction is the magnet moving?

• Left

• Right

• Up

• Down

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Which direction will the force act on the current shown above?

• Into the page

• Out of the page

• Up the page

• Down the page

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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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What does the direction of the pointing fingers mean in this picture?

• the direction of the voltage

• the rotation of the wire

• the direction of the magnetic field

• the direction of the current

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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 magnet can move in a coil of wire to produce electricity in which system?

• Generator

• Motor

• Magnet

• Transformer

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In what direction is the magnet moving?

• Left

• Right

• Up

• Down

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Which of the following laws is associated with Michael Faraday's work on electromagnetism?

• Ohm's Law

• Faraday's Law of Electromagnetic Induction

• Coulomb's Law

• Ampere's Law

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