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Homework Help: Electric motors & faraday's law

  1. Oct 2, 2008 #1
    1. The problem statement, all variables and given/known data
    Eliza connects a power supply, switch, and a multimeter (in ammeter mode) in series with a wire coil. The wire coil is held into place by 2 connecting wire leads. One of the wire leads has been stripped off of the insulating enamel coating so that half the wire is bare; the other lead has been completely stripped bare.

    1. What orientations of the coil will give a current through it due to the battery?

    2. During the time that there is a current through the coil, which side of the coil will act like a north pole and which side will act like a south pole? Explain?

    3. How will the coil behave when placed above the magnet and the switch is closed?

    2. Relevant equations
    Faraday's Law: E=-d(magnetic flux)/dt
    Magnetic Flux = B*Acos([tex]\theta[/tex]

    3. The attempt at a solution
    The part without coating will give a current, but the part that has coating will not?
    Very lost...
  2. jcsd
  3. Oct 2, 2008 #2


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    For the rest, it's hard to see what's going on without a figure.
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