1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Finding magnitude of a particle

  1. Oct 17, 2009 #1
    1. The problem statement, all variables and given/known data
    A magnet produces a 0.90 T field between its poles, directed to the east. A dust particle with charge q = -1.0 10-18 C is moving straight down at 0.70 cm/s in this field. What is the magnitude and direction of the magnetic force on the dust particle?

    2. Relevant equations


    3. The attempt at a solution
    (1.0e-18)(.007)(.90)=-6.3e-21 which is wrong

    I followed the same format as someone else and my answer is wrong. can you help point out what the mistake is? thanks.
  2. jcsd
  3. Oct 17, 2009 #2


    User Avatar

    Staff: Mentor

    Your magnitude looks correct. What direction did you get via the right-hand rule?
  4. Oct 17, 2009 #3
    my direction is north
  5. Oct 17, 2009 #4
    never mind i figured out the answer. thanks for your help
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook