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Homework Help: Magnitude of magnetic force?

  1. Feb 15, 2009 #1
    1. The problem statement, all variables and given/known data
    An electron travels at a speed of 2.0x10^4 m/s through a uniform magnetic field whose magnitude is 1.2x10^-3 T. What is the magnitude of the magnetic force on an electron if its velocity and magnetic field:
    a. are perpendicular?
    b. make an angle of 45 degrees?
    c. are parallel?
    d. are exactly opposite?

    2. Relevant equations
    F = qvB(sin [tex]\vartheta[/tex]

    3. The attempt at a solution
    I haven't made any attempts because there is no q value...
  2. jcsd
  3. Feb 15, 2009 #2


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    Homework Helper

    It is an electron - look up the charge on an electron.
    Soon you will have it memorized!
  4. Feb 15, 2009 #3
    ...I'm slightly embarrassed because I completely looked over that detail. Thank you for pointing that out.
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