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What is the potential energy of this group of charges?

  1. Feb 15, 2016 #1
    1. The problem statement, all variables and given/known data
    Three electrons form an equilateral triangle 0.800 nm on each side. A proton is at the center of the triangle.

    2. Relevant equations
    U = k[(q_1*q_2)/r]

    3. The attempt at a solution
    I tried to use the following equation:

    k*[(3e^2)/(0.8*10^-9) - (3e^2)/(0.4*10^-9)]

    I plugged in 1.602*10^-19 for both e-values, and got the following answer:

    -6.4*10^-19 Volts

    However, it says that "I do not have the correct dimensions." I'm not sure what that error means or what I did wrong, so any help would be appreciated.
     
  2. jcsd
  3. Feb 15, 2016 #2

    gneill

    User Avatar

    Staff: Mentor

    There's no question in your problem statement... thread titles don't really count as part of the problem statement. :smile:

    "Dimensions" refer to the units associated with your answer. What are the units of potential energy, as opposed to electric potential?
     
  4. Feb 15, 2016 #3
    Oh my goodness what a dumb mistake! thank you!
     
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