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Homework Help: Earths Magnetic Flux

  1. Apr 11, 2009 #1
    1. At a certain location, the Earth's magnetic field has a magnitude of 5.6x10-5 T and points in a direction that is 72 degrees below the horizontal. FInd the magnitude of the magnetic flux through the top of a desk at this location that measures 110 cm by 57 cm.

    2. I used the formula [tex]\Phi[/tex] = BA cos [tex]\theta[/tex]

    3. The attempt at a solution
    [tex]\Phi[/thex] = 5.6x10-5 x 1.10m x .57m x cos 72
    =1.1e-5 Wb and it's wrong
  2. jcsd
  3. Apr 11, 2009 #2


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    Homework Helper

    Welcome to PF.

    Is the desk top a vertical surface or a horizontal one?

  4. Apr 11, 2009 #3

    Horizontal. and since the I'm looking for the magnetic flux, it should be perpendicular to the area so I use sine instead of cosine. What a stupid mistake haha, thank you for your help!
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