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How to find electric potential given only velocity

  1. Feb 14, 2017 #1
    1. The problem statement, all variables and given/known data
    Given v = v=4.8×105m/s find the change in electric potential.

    2. Relevant equations
    ΔV = Vf-Vi = -W/q

    3. The attempt at a solution
    I really don't know any other formula that has the use of velocity to find ΔV. So how does velocity end up into the mix in finding ΔV?
     
  2. jcsd
  3. Feb 14, 2017 #2

    gneill

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    Staff: Mentor

    There has to be more to the given problem than what you've written. A velocity alone says nothing about what the scenario is. What is the complete problem statement?
     
  4. Feb 14, 2017 #3
    Here is a picture. upload_2017-2-14_19-6-10.png
     
  5. Feb 14, 2017 #4

    berkeman

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    Staff: Mentor

    Whelp, that post didn't go so well.

    It's good to know that v=v, that's always a good start... :smile:

    A potential difference produces an accelerating force on a charged particle, not just a "velocity" in isolation. There needs to be a lot more to this question that you haven't posted so far?

    EDIT -- gneill beat me to it (again)...
     
  6. Feb 14, 2017 #5

    berkeman

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    Staff: Mentor

    Oh, that's a lot easier. What do you know about the units of energy "eV" (electron Volts) and how you express the kinetic energy of a moving electron...?
     
  7. Feb 14, 2017 #6
    Well units of energy eV is 1.6*10^-19 J and KE = 1/2mv^2 for an electron.
     
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