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Homework Help: What is the magnitude of the electric field?

  1. Mar 10, 2009 #1
    1. The problem statement, all variables and given/known data
    What is the magnitude of the electric field in the region between the plates?
    The charge on the sphere is 5.00 mC
    The image needed to visualize situation:
    mass of sphere = 3.2grams
    2. Relevant equations
    F = EQ
    Fg = mg

    3. The attempt at a solution
    First, I drew a free body diagram. Tension went up along the thread, Fg (gravity) was pointing down at the electrical force was pointing to the right. I then solved for Fg, which I got .03136N from multiplying (9.8)(.0032). I then set Ft(tension) * cos30 = .03136, which I then got Ft = .0362114089. I then plugged my Ft, multiplied it by sin30 in order to get the electrical force, which turned out to be .0181057044. From there, I used the equation F=EQ, which I did (.0181057044)(5e-3), which i then ended up with 3.621140888 N/C which was obviously the wrong answer.
  2. jcsd
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