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Finding velocity with magnetism?

  1. Feb 27, 2009 #1
    1. The problem statement, all variables and given/known data

    An electron moves at right angles to a magnetic field of .14T What is its speed if the force exerted on it is 8.7 X 10^-15 N?

    I am at a complete lossfor this question.
     
  2. jcsd
  3. Feb 27, 2009 #2

    hage567

    User Avatar
    Homework Helper

    Look up magnetic force (or Lorentz force law).
     
  4. Feb 27, 2009 #3
    so if F=qvB
    then V=Bq/F

    but when i plus in the charge for the electron is it negative or postive 1.6 x 10^-19 bc can a velocity be a negative answer?
     
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