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Work needed to move an Electron

  1. Sep 13, 2015 #1
    1. The problem statement, all variables and given/known data
    Calculate the amount of work (in electron-volts) it would take to move an electron from 15.1 m to 16.2 m away from a +3.50 μC point charge.

    2. Relevant equations
    W=qΔV (?)



    3. The attempt at a solution
    None yet. I'm not even sure where to start!
     
  2. jcsd
  3. Sep 13, 2015 #2

    mfb

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    That equation can be useful, yes.

    What is the potential of a point charge at a distance r?
     
  4. Sep 13, 2015 #3

    HallsofIvy

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    The force will decrease as you move the electron away from the charge so just "force times distance" is not sufficient. You will need to use "integral or force times dx".
     
  5. Sep 13, 2015 #4

    BvU

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    Correct. And complicated. That's why it's convenient to use the potential. Post #2 puts the key question for this one !
     
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