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Homework Help: Magnetism Question

  1. Apr 2, 2010 #1
    1. The problem statement, all variables and given/known data

    Given: A tightly wound circular coil has
    81.9 turns , each of radius 0.1 m. The uniform
    magnetic field is in a direction perpendicular
    to the plane of the coil. The field increases
    linearly from 0 T to 0.851 T in a time of
    0.364 s .
    What E is induced in the windings of the
    Answer in units of V.
    2. Relevant equations

    emf(average)=magnetic flux/time

    3. The attempt at a solution
    I think this can be solved using magnetic flux, but i dont reallly know how to go about doing it
  2. jcsd
  3. Apr 2, 2010 #2


    User Avatar
    Homework Helper

    Start with your equation

    emf = -dΦ/dt where Φ=NBA, thus your equation becomes

    emf = -d/dt(NBA)

    N and A are constant so emf=-NA dB/dt. So how you would get dB/dt which is the rate of change of the magnetic field per unit time.
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