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Why is the increase in kinetic energy of the particle after being accelerated

  1. Jul 14, 2011 #1
    1. The problem statement, all variables and given/known data

    what is the increase in kinetic energy of the particle after being accelerated by a potential V/2?

    3. The attempt at a solution

    The textbook says it is q*V/2 but I just wondered why this is the case
     
  2. jcsd
  3. Jul 15, 2011 #2

    Delphi51

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    Homework Helper

    You probably have two defining formulas for electric potential:
    1) potential is the energy per charge, V = Ee/q or Ee = qV
    This is the very formula you want explained . . . but it is a definition rather than an explanation.

    2) Electric potential causes an electric field between electrodes, E = V/d where d is the distance between the plates. The electric force is F = qE so putting E = F/q into the first formula you have F/q = V/d or F*d = q*V. F*d is the work done as the charge moves through the potential difference so W = q*V. Work done is the energy gained so we have energy = qV.
     
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