Finding velocity with magnetism?

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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.
 

hage567

Homework Helper
1,510
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Look up magnetic force (or Lorentz force law).
 
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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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