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Magnetic forces

  1. Aug 6, 2016 #1
    1. The problem statement, all variables and given/known data
    An electron that has a velocity with x component 2.1 × 106 m/s and y component 3.1 × 106 m/s moves through a uniform magnetic field with x component 0.035 T and y component -0.16 T. (a) Find the magnitude of the magnetic force on the electron. (b) Repeat your calculation for a proton having the same velocity.

    2. Relevant equations

    3. The attempt at a solution
    I did the work, got an answer for part A which is 7.112e-14
    Did the exact same procedure for part B and arrived at -7.112e-14, but the homework website is telling me it's wrong?! Not sure what my error is...
  2. jcsd
  3. Aug 6, 2016 #2


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    The question asks for the magnitude of the force.
  4. Aug 6, 2016 #3

    Silly me, I should read questions more carefully. Forgot to absolute value on both parts, only with a it work out by luck! Thanks.
  5. Aug 6, 2016 #4


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    OK, good.
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