Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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


    User Avatar
    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.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook