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Homework Help: Induced Voltage created on a loop entering a magnetic field

  1. Apr 13, 2012 #1
    1. The problem statement, all variables and given/known data

    A 0.69m long and 0.69m wide loop is moved at a constant velocity of 0.81m/s from a region of zero magentic field into a perpendicular constant magnetic field of 0.21T. Calculate the magnitude of the induced voltage in the loop while it is entering the B-field

    2. Relevant equations

    3. The attempt at a solution
    I can plug in the numbers for the number of loops N (1), the area A (LxW), and the magnitude of the field B (.21T), but how do I find the time from just knowing the velocity?
  2. jcsd
  3. Apr 13, 2012 #2


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    welcome to pf!

    hi allison20! welcome to pf! :smile:
    no, it's -∂/∂t (NAB) :wink:

    (ie -∂/∂t (magnetic flux) )
  4. Apr 13, 2012 #3
    If you know the velocity and dimensions you should be able to calculate area swept out per second and therefore flux change per second
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