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Homework Help: Multiple choice, magnetic force on the particle

  1. Oct 20, 2012 #1
    1. The problem statement, all variables and given/known data

    2zsuuxg.jpg


    2. Relevant equations



    3. The attempt at a solution

    I know that since the charge is negative qo*Vperpendicular would be traveling in the oppsite direction. Which by the right hand rule ultimately affects B.

    So using the formula F=q0V(perpendicular)*B

    = 1*5(4i-3j)
    = (20i-15j)

    I don't understand why the answer would be D.

    Or maybe my approach to the problem was incorrect?

    Thanks
     
  2. jcsd
  3. Oct 20, 2012 #2
    The equation is [itex]\vec{F}=q\vec{v}\times\vec{B}=-1C*5\hat{k}\frac{m}{s}\times(3\hat{i}-4\hat{j})T[/itex]. What is [itex](-1)(-4)\hat{k}\times\hat{j}[/itex]?
     
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