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Homework Help: Direction of particle in electric field

  1. Jun 13, 2015 #1
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
    When the positive particle enters the electric field it will turn and move toward the negative plate. So

    a) the displacement vector will change direction until it's directed toward the negative plate, parallel with the electric field.

    b) the velocity will also change direction in the same way as the displacement.

    c) the linear momentum is directed in the same way as the velocity

    d) the acceleration will be directed inwards from the curve movement, so it will be parallel at first but not in the end.

    So the answer would be that a), b) and c) are parallel (not at first, but in the end) and d) is parallel at first but not in the end.

    Is my reasoning incorrect?

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  3. Jun 13, 2015 #2
    You ask to choose one from given answers. There is no reference about the start, the middle or the end of motion but one of these four thinks is correct for the whole movement.
  4. Jun 13, 2015 #3
    Displacement vector is a vector which shows difference between where the motion start and where it and end.Here is the picture I give an example now look the example and think about your quesion again.When you find displacement vector you can find velocity and lineer momentum vectors.For Accelaration vector thing this way.We need force for accelaration.Force direction and accelaration direction is same.So which force acting on this object and whats the force direction.Think this way and you'll find the answer

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