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Kinetic energy from plate A to plate B

  1. Feb 24, 2013 #1
    1. The problem statement, all variables and given/known data
    An electron acquires 3.45x10^(-16) J of kinetic energy when it is accelerated by an electric field in a computer monitor from plate A to plate B. What is the potential difference between the plates, and which plate is at the higher potential?


    2. Relevant equations
    KE=1/2mv^2


    3. The attempt at a solution
    The given answer is 2.16x10^3V...How and why?
    Plate B has the higher potential.
     
  2. jcsd
  3. Feb 24, 2013 #2
    What is the potential energy of the electron at plate A?
     
  4. Feb 24, 2013 #3
    Nothing is given other than the acquired electron energy of 3.45x10^(-16). Sorry!
     
  5. Feb 24, 2013 #4
    Would the electron be attracted to a positive plate or a negative plate? Which plate (positive or negative) would have a higher potential?

    Conservation of Energy: All the electric potential will be converted to kinetic.
     
  6. Feb 25, 2013 #5
    That is correct, but the electron still has some potential energy. How is it related to the difference of the plates' potentials?
     
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