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Electric flux through a surface

  1. Mar 16, 2014 #1
    1. The problem statement, all variables and given/known data

    Find the electric flux through the plane surface shown in the figure below if θ = 64.2°, E = 375 N/C, and d = 4.70 cm. The electric field is uniform over the entire area of the surface.

    2. Relevant equations



    3. The attempt at a solution

    By using the equation:EAcosθ
    375x0.0472cos64.2=0.167
    I've found that answer is 0.167N.m2/C,but it is not correct.
    What is the correct answer?
     

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    Last edited: Mar 16, 2014
  2. jcsd
  3. Mar 16, 2014 #2

    jtbell

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    Staff: Mentor

    Please show us exactly how you calculated your answer.
     
  4. Mar 16, 2014 #3
    I'v edited the content of my thread.Tell me of there are any things are need to be added.
     
  5. Mar 16, 2014 #4
    You have done the calculations incorrectly, what did you input in your calculator?
     
  6. Mar 16, 2014 #5
    375x0.0472cos64.2=0.167
     
  7. Mar 16, 2014 #6
    I don't seem to be getting 0.167 with Wolfram Alpha.
     
  8. Mar 16, 2014 #7
    But I cannot get he other answer.:cry:
     

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  9. Mar 16, 2014 #8
    E=375
    d2 = .002209
    Cos64.2° = .435231

    Multiply the three quantities and you should get something like .3605
     
  10. Mar 16, 2014 #9
    because the tool is interpreting the angle 64.2 in radians .
     
  11. Mar 16, 2014 #10
    Thanks. I finally found that I have changed the mode of my calculator into radian,so I cannot find the correct answer.
     
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