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Angle of electron in an electric field

  1. Jan 4, 2017 #1
    1. The problem statement, all variables and given/known data

    https://imgur.com/zEoCpc0
    upload_2017-1-4_21-22-49.png

    I am trying to figure put the angle and my attempt is tanx=sy/sx (I have calculated a value for the distances)

    But my book is saying: tanx =vy/vx

    I don't understand why my way of solving it is wrong... I dont get the same answer for x :/
     

    Attached Files:

    Last edited by a moderator: Jan 4, 2017
  2. jcsd
  3. Jan 4, 2017 #2

    TSny

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    Suppose you drive your car around a corner from point A to point B. The direction you are traveling when you get to B is given by the direction of your velocity VB at B. The angle θ, such that tanθ = sy/sx, is the angle of the red line that connects points A and B. But this is not the direction that you are traveling at B.
    upload_2017-1-4_17-51-27.png
     
  4. Jan 5, 2017 #3
    You are calculating two different angles. Here tanθs≠tanθv. See this picture for clear explanation:
    wj6ih.png
    Original post link.
     
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