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Homework Help: Electric flux?

  1. Feb 2, 2015 #1
    1. The problem statement, all variables and given/known data

    The drawing shows an edge-on view of two planar surfaces that intersect and are mutually perpendicular. Surface (1) has an area of 2.20 m², while surface (2) has an area of 3.90 m². The electric field in the drawing is uniform and has a magnitude of 200 N/C. Find the magnitude of the electric flux through surface (2) if the angle θ made between the electric field with surface (2) is 35.0°.
    2. Relevant equations

    I used gausse law
    3. The attempt at a solution

    Sinnce they are looking for magnitude of surface 2 I thought the answer was 638.9 but I got it wrong.
  2. jcsd
  3. Feb 2, 2015 #2


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    Welcome to PF!

    You used cos(35) when calculating the flux through surface 2. Think about whether or not you used the correct angle here.
  4. Feb 2, 2015 #3
    what do u mean?
  5. Feb 2, 2015 #4
    ok since it is a 90 degree angle then subtracting 35 should give me 55 right?
  6. Feb 2, 2015 #5
    Yes, using Gauss' Law, EAcosθ, where θ refers to the angle between the electric field's direction and the line perpendicular to the area of application (which is the dot product of E and A, E⋅A)
  7. Feb 2, 2015 #6
    thank u!!!!!!!!!!
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