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Magnetostatics multiple choice

  1. Apr 17, 2012 #1
    1. The problem statement, all variables and given/known data

    A charged particle traveling with a velocity v in a magnetic field B experiences a force F that must be:

    A. parallel to v
    B. perpendicular to only v
    C. parallel to v-B
    D. parallel to B
    E. perpendicular to v x B


    2. Relevant equations

    Requires this right hand rule, I believe:
    http://upload.wikimedia.org/wikipedia/commons/6/6f/Right_Hand_Rule_vBF2.PNG

    3. The attempt at a solution

    Looking at the diagram, I'd say that the force should be perpendicular to both the force and the velocity and I had originally picked E. E is not correct, so would the right answer be B? But that would mean that force is not perpendicular to v and it very clearly is....
     
  2. jcsd
  3. Apr 17, 2012 #2

    collinsmark

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    Are you sure you copied down the problem correctly? Including the choices? The answer isn't E, but it's not quite any of the other others either, as they're presently written.
     
  4. Apr 17, 2012 #3

    tiny-tim

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    goomer, can you check the wording of C ?
     
  5. Apr 17, 2012 #4
    Oh sorry! C should be "Parallel to vxB".

    I assume is C is the right answer then? If so, why?
     
  6. Apr 17, 2012 #5

    collinsmark

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    Maybe this will help.
    http://en.wikipedia.org/wiki/Cross_product
     
  7. Apr 18, 2012 #6

    tiny-tim

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    from the pf library
    The cross product of two vectors [itex]\mathbf{A}[/itex] and [itex]\mathbf{B}[/itex] is a third vector (strictly, a pseudovector or axial vector) [itex]\mathbf{A}\times\mathbf{B}[/itex] perpendicular to both of the original vectors … :wink:
     
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