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Magnetism Question Can't figure it out

  1. Oct 21, 2009 #1
    1. The problem statement, all variables and given/known data

    In a certain region, the earth's magnetic field has a magnitude of 5.5 x 10-5 T and is directed north at an angle of 40° below the horizontal. An electrically charged bullet is fired north and 19° above the horizontal, with a speed of 700 m/s. The magnetic force on the bullet is 3.9 x 10-10 N, directed due east. Determine the bullet's electric charge, including its algebraic sign (+ or -).

    2. Relevant equations

    F=qvBsintheta

    3. The attempt at a solution

    3.9E-10N= q* 700m/s(V)*5.5E-5T (B)*sin19
    =3.1E-8N
     
  2. jcsd
  3. Oct 21, 2009 #2

    rl.bhat

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    Angle between v and B is ....?
     
  4. Oct 21, 2009 #3
    59degrees?
     
  5. Oct 21, 2009 #4

    rl.bhat

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    Substitute this value in the problem instead of 19 degrees.
     
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