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Homework Help: Electromagnetism homework question

  1. Jan 19, 2005 #1
    1. A simple generator has a 200-loop square coil 25.0cm on a side. How fast must it turn in a 0.550T field to produce a 120V peak output?


    t=8.6x10^-2 s
    do you need to times it by 4 to get the time for one rotation??

    2. A motor has an armature resistance of 3.40ohms. If it draws 8.70A when running at full speed and connected to a 120V line, how large is the counter emf?
    Is this right????

    3. A 30cm diameter coil consists of 30 turns of circular copper wire 2.8mm in diameter. A uniform magnetic field, perpendicular to the plane of the coil, changes at a rate of 8.65x10^-3T/s. Determine the current in the loop.

    I have no idea how to start this question.
    Plz help...thx...
  2. jcsd
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