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Homework Help: Angle of electron in an electric field

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


    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 :/

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


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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.
  4. Jan 5, 2017 #3
    You are calculating two different angles. Here tanθs≠tanθv. See this picture for clear explanation:
    Original post link.
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