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Direction of force on the charge?

  1. Jan 26, 2013 #1
    1. The problem statement, all variables and given/known data

    A uniform electric field has a magnitude E and is directed in the +x-direction. A negative (-) charged particle is placed in the electric field. Determine the direction of the force on the charge.

    A) +x direction
    B) -x direction
    C) 45 degrees below the -x axis
    D) -y direction
    E) 45 degrees above the +x axis
    F) +y direction


    2. Relevant equations

    F = ma


    3. The attempt at a solution

    Using the x- and y-axes, the electric field is in the -y-direction and the initial velocity of the electron is in the +x-direction and the initial velocity of the electron is in the +x-direction. The electric force on the electron is upward (in the +y-direction) since it has a negative charge and is constant because the field is uniform. Thus, the acceleration of the electron is constant and directed upward. Since the acceleration is in the +y-direction, the x-component of the velocity is constant.

    Thus, I chose (E) for the answer.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Jan 26, 2013 #2

    tiny-tim

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    Homework Helper

    hi awilliam_3! :smile:
    i'm confused :redface:

    what does velocity have to do with it? :confused:

    (this isn't a magnetic field :wink:)
     
  4. Jan 26, 2013 #3
    Oh my, now I'm confused.
     
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