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What is the magnitude of the uniform electric field

  1. Sep 5, 2008 #1
    Each of the electrons in a particle beam has a kinetic energy of 1.40 10-17 J.
    (a) What is the magnitude of the uniform electric field (pointing in the direction of the electrons' movement) that will stop these electrons in a distance of 13.0 cm?
    correct check mark N/C

    (a) was 673 N

    (b) How long will it take to stop the electrons?
    wrong check mark
    Your answer differs from the correct answer by 10% to 100%. ns
    (c) After the electrons stop, the electric field will act on them, causing the electrons to accelerate in a direction correct check mark at what rate?
    wrong check mark
    Your answer differs from the correct answer by orders of magnitude. m/s2 i was not able to find the answers for par b and c and help would be appreciated!!! thanks
     
  2. jcsd
  3. Sep 5, 2008 #2
    a : W = F d = q E d = K.E.
    b : F = m a = q E && x = (1/2) a t^2
    c : see above
     
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