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Homework Help: Magnitude of Magnetic Field

  1. May 12, 2010 #1
    1. The problem statement, all variables and given/known data

    A rectangular loop of wire is moving toward the bottom of the page with a speed of .042 m/s. The loop is leaving a region in which a magnetic field is directed into the page; the magnetic field outside this region is zero. If during the time of 1.5 s the magnitude of the change in magnetic flux is .0044 Wb, what is the magnitude of the magnetic field?

    2. Relevant equations

    E = delta flux / delta time ???

    3. The attempt at a solution
    I thought this was the equation to use mainly. but i have no idea where the veloicty comes into play. any help would be appreciated!
  2. jcsd
  3. May 12, 2010 #2
    Flux is B*A in this case, and you know d/dt (flux) = .0044. So you need to discover what part of the flux is changing: B, A, both?
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