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Electrical Potential Difference between two plates

  1. Mar 22, 2009 #1
    1. The problem statement, all variables and given/known data
    HELP!!
    A charged particle is stationary between two horizontal charged plates. The plates are 2.0 cm apart. The particle has a mass of 4.0X10^-13 kg and a charge of 2.4 X 10^-18 C. Find the potential difference between the plates.


    2. Relevant equations

    V= EPE/q ???
    ...except I have no idea how to find the potential energy. Also, I have no clue how the mass given in the problem fits into an equation.

    3. The attempt at a solution
    I need someone to help me start this!
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Mar 22, 2009 #2

    Delphi51

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    Homework Helper

    Looks like a force-balance problem. The force of gravity (down) on the particle is balanced by an equal electric force (up). Begin with Fg = Fe and fill in the detailed formulas before solving for what you want.
     
  4. Mar 22, 2009 #3
    So is this how I would do it?:
    PE=mgh
    PE=(4.0x10^-13)(9.8m/s/s)(1.0cm)
    PE=3.92x10^-12

    V= EPE/q
    V=3.92x10^-12/2.4x10_18C
    V= 6.8x10^23V
    I dont think I did it right...
     
  5. Mar 22, 2009 #4

    Delphi51

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    Homework Helper

    Fg = Fe
    mg = qE
     
  6. Mar 22, 2009 #5
    Thank you :]
     
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