1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: 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

    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?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted