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!

Electric Fields and Kinetic Energy of protons

  1. Apr 11, 2010 #1
    1. The problem statement, all variables and given/known data

    Each of the protons in a particle beam has a kinetic energy of 3.25 x 10^-15 J. What are the magnitude and direction of the electric field that will stop these protons in a distance of 1.25 m?

    2. Relevant equations

    Felectric = kC (q*q/r^2)
    Electric Field= Felectric/q
    Electric Field= kC (q/r^2)
    Velocityfinal= velocityInitial + a*t
    Velocityfinal^2 = VelocityInitial^2 + 2a(d)

    3. The attempt at a solution

    I need help with this.
  2. jcsd
  3. Apr 11, 2010 #2


    User Avatar
    Homework Helper

    Work done by the electric force = change in the KE.
    Initial KE is given. Final KE = .........?
    Work done by the electric force F = ......?
    And as you have stated E = f/q.
    Now try.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook