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Magnitude of force on charged particle

  1. Jul 24, 2017 #1
    1. The problem statement, all variables and given/known data
    Screen Shot 2017-07-24 at 6.48.16 pm.png

    2. Relevant equations


    3. The attempt at a solution
    I know the equation of force on a moving charge in a magnetic field is F=BqV...
    Why is the answer A ?
     
  2. jcsd
  3. Jul 24, 2017 #2

    cnh1995

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    What is the original vector equation for this force?
     
  4. Jul 24, 2017 #3
    F=qvBsinθ ?
     
  5. Jul 24, 2017 #4

    cnh1995

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    Yes. It's actually q(vxB), where vxB is the cross product of v and B.
    What is the cross product of v and B in this problem?
     
  6. Jul 24, 2017 #5
    0?
     
  7. Jul 24, 2017 #6

    cnh1995

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    Yes.
     
  8. Jul 24, 2017 #7
    Thank you!
     
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