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Parallel plate capacitorsplease help!

  1. May 4, 2008 #1
    A point charge of mass 0.0836 kg and charge q = +6.84 μC is suspended by a thread between the vertical parallel plates of a parallel-plate capacitor, as shown in the figure below.

    If the angle of deflection is θ = 22.3°, and the separation between the plates is d = 0.0221 m, what is the potential difference between the plates?

    sorry it wouldn't let me paste the picture..
  2. jcsd
  3. May 4, 2008 #2
    If you know the gravitational force and most of the details about the electric force you can use trigonometry to figure out how they relate. How far are you?
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