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Potential difference between two plates! Please help

  1. Sep 3, 2009 #1
    A small sphere with mass 2.10 g hangs by a thread between two large parallel vertical plates 5.00 cm apart . The plates are insulating and have uniform surface charge densities + sigma and - sigma . The charge on the sphere is q = 7.70×10−6 C

    What potential difference between the plates will cause the thread to assume an angle of 30.0 degrees with the vertical?
     
  2. jcsd
  3. Sep 3, 2009 #2

    diazona

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    Sounds like a homework question...

    What have you tried?
     
  4. Sep 3, 2009 #3
    Trying the potential difference equations, but the angle is messing my calculations up
     
  5. Sep 3, 2009 #4

    rl.bhat

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    In the equilibrium position, what are the forces acting on the charged sphere?
     
  6. Sep 3, 2009 #5
    The electric field, gravity and the tension of the string?

    What formula would I need?
     
  7. Sep 4, 2009 #6

    rl.bhat

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    Draw the free body diagram with these forces. Resolve them in to x and y components. For equilibrium equate net X-component and net y-component equal to zero.
     
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