Finding velocity with magnetism?

AI Thread Summary
To find the speed of an electron moving perpendicular to a magnetic field of 0.14T with a force of 8.7 x 10^-15 N, the Lorentz force equation F=qvB can be used. Rearranging the formula gives v=Bq/F. The charge of the electron is -1.6 x 10^-19 C, but the magnitude is used for calculating speed, so the velocity will be a positive value. Concerns about negative velocity arise from the electron's charge, but speed itself is always a positive quantity. The calculation ultimately leads to the electron's speed in the magnetic field.
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Homework Statement



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.
 
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Look up magnetic force (or Lorentz force law).
 
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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