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Proton and an electric field?

  1. Jan 13, 2008 #1
    1. The problem statement, all variables and given/known data

    A proton moving to the right along the x-axis at 3.8*10^5m/s, enters a region where the electric field of intensity 5.6*10^4n/c points to the left. How far will the proton move before its speed reaches zero? Describe the subsequent motion in deatail/

    2. Relevant equations

    dont know whethere to about doing this with force of energy so I really dont know.

    3. The attempt at a solution

    Im not really sure how to start this, some helpful hints would be appretiated. Thanks.
  2. jcsd
  3. Jan 13, 2008 #2


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    try [tex]\vec F= \vec E q[/tex]

    E is electric field vector
    q is the charge feeling the force
  4. Jan 13, 2008 #3
    Ok but if I work out this force easily enough how is this going to tell me what then time is when its speed gets to zero?
  5. Jan 13, 2008 #4


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    F=ma, once you know a, and if it is constant then that's just kinematic in 1D....
  6. Jan 13, 2008 #5
  7. Jan 13, 2008 #6
    Do you have any idea of what i would be expected to write in the "describe the motion" part?
  8. Jan 13, 2008 #7


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    once you know how proton moves under the field, you are done I think....
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