Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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]
    And
    [tex]\phi_m = \int\limits_{A}^{}B}\, dA=BAcos(\theta)[/tex]

    [tex]V_{induced}=\frac{d(BAcos(\theta))}{dt}[/tex]

    You need to relate [tex]\theta[/tex] to time and use that last equation I gave you to solve for [tex]B[/tex]
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook