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Homework Help: Magnitude of Flux Density

  1. Feb 7, 2010 #1
    1. A loop of wire between the poles of a magnet, the magnetic field is uniform between the poles. The are of the loop of wire within the field is 20cm sqaured. Determine the magnitude of flux density required to induce a mx voltage of 1v when the loop is rotated at 600rpm

    2. B= Flux x A

    3. I know A however cant figure out where to go next, any pointers please. I am not asking to be solved just pointers please
  2. jcsd
  3. Feb 7, 2010 #2
    [tex]\frac{d\phi_m}{dt} = V_{induced}[/tex]
    [tex]\phi_m = \int\limits_{A}^{}B}\, dA=BAcos(\theta)[/tex]


    You need to relate [tex]\theta[/tex] to time and use that last equation I gave you to solve for [tex]B[/tex]
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