1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Parallel plate capacitor by an electric field between the plates

  1. May 26, 2012 #1
    1. The problem statement, all variables and given/known data

    A 10 gram pith ball having a charge of 1μC is electrostatically attracted to one of the inside surfaces of a large parallel plate capacitor by an electric field between the plates. The plates are vertically oriented so that the electric field between the plates is horizontal. The distance between the plates of the capacitor is 10 cm, and the coefficient of static friction between the pith ball and the plate is 0.5.
    What is the minimum voltage needed to keep the ball from sliding down the plate from gravity? Draw a picture to show all forces on the pith ball.

    2. Relevant equations

    ????

    3. The attempt at a solution

    I'm totally at a loss
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. May 26, 2012 #2

    ehild

    User Avatar
    Homework Helper
    Gold Member

    That pith ball is "stuck" to a plate by electric force. How big is that force, and what is its direction? What other forces act on the pith ball?

    ehild
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Parallel plate capacitor by an electric field between the plates
Loading...