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Homework Help: Work on a proton/Electic Potential

  1. Mar 30, 2010 #1
    1. The problem statement, all variables and given/known data

    Imagine that a proton is held on the end of an insulated rod. How much external work is needed to move the proton from a point with a potential of 95 V to a point where it is -54V?
    Express your answer in Joules, watch out for the sign of the answer.

    2. Relevant equations

    3. The attempt at a solution
    I thought that you could use U=qV but it's not working- I also don't know what the point charge (q) would be. I chose this equation because you can relate the change in potential to work (U=-W)... Guidance would be great!
  2. jcsd
  3. Mar 30, 2010 #2
    Nevermind, I figured it out.. :)
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