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Electric Potential Energy and micro-joules

  1. Feb 17, 2015 #1
    1. The problem statement, all variables and given/known data
    A uniform electric field of 16.9 N/C is directed in the positive x direction. If a charge of -2 micro-coulombs moves 2.2 meters in the negative x direction, how much does the electric potential energy change in micro-joules?

    2. Relevant equations
    ΔEPE = qEd

    3. The attempt at a solution

    Since the charge is moving against the field the change in EPE should be positive, therefore I just plugged in the numbers and got 111.04. That answer was wrong, however, but I have no idea why. Any help would be appreciated.
     
  2. jcsd
  3. Feb 17, 2015 #2

    Doc Al

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    Staff: Mentor

    But it's a negative charge.
     
  4. Feb 17, 2015 #3

    Doc Al

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    Staff: Mentor

    Redo that calculation as well.
     
  5. Feb 17, 2015 #4
    Also, make sure your units are all on the same scale.
     
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