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Electric Dipole Moment question

  1. Feb 9, 2013 #1
    1. The problem statement, all variables and given/known data
    Point charges +4.70 and -4.70 are separated by distance 3.90mm, forming an electric dipole.
    The charges are in a uniform electric field whose direction makes an angle 37.0 degrees with the line connecting the charges. What is the magnitude of this field if the torque exerted on the dipole has magnitude 7.00×10−9 Nm ?


    2. Relevant equations
    τ=d(sinθ)qE
    E=τ[itex]/[/itex](sinθ)dq


    3. The attempt at a solution
    (7E-9) / sin(30)(.0039)(4.7E-9)

    763.78 N/C

    What am I doing wrong?
     
  2. jcsd
  3. Feb 9, 2013 #2

    ehild

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    Gold Member

    Is the angle 30 or 37 degrees?

    ehild
     
  4. Feb 9, 2013 #3
    37, thank you
    I was getting so frustrated, stupid error
    For anyone else who reads this thread you should get 634.6N/C when you plug in sin(37) into the equation above
     
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