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Homework Help: Magnetic Forces on Charged Particles

  1. Feb 24, 2009 #1
    1. The problem statement, all variables and given/known data

    A particle with a charge of +8.4 µC and a speed of 55 m/s enters a uniform magnetic field whose magnitude is 0.30 T. For each of the cases in the drawing, find the magnitude and direction of the magnetic force on the particle.


    2. Relevant equations

    B = F / [q(VsinΘ)]

    3. The attempt at a solution

    Ok, for case (a) I tried the following:

    - 30 = F / [8.4*10^6(55sin30)]
    - 30 = F / 27.5
    - 30 * 27.5 = F
    - F= 825 N

    Where am I going wrong? Thanks!
  2. jcsd
  3. Feb 24, 2009 #2


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    Homework Helper

    Welcome to PF.

    Remember these are vectors and the Force vector will be in what direction?

    And it is determined by what scalar operation?
  4. Feb 24, 2009 #3


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    Homework Helper

    Also note your B field is .3T
  5. Feb 24, 2009 #4
    Ah, of course. I'm not sure how I kept reading B as "30" rather than ".3" lol.

    So the actual answer would be 6.93E-5.

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