1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    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!

Help with investigation

  1. Jul 15, 2005 #1
    Hi, I'm doin an investigation in physics - magnetism, to be specific - and basically I'm takin 1 or 2 bar magnets, and a hall probe, and placing the magnets at different distances from the probe, and different angles to see the variation in magnetic field strength. However, I need to extend it a lot more than this, and I'm not really sure how. I should do more research but I haven't had much time.

    I was wonderin if anyone could gimme some pointers on what I could do next, or gimme a site with some information on this topic. Thanks a lot.
     
  2. jcsd
  3. Jul 16, 2005 #2

    Meir Achuz

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    At large distance from a bar magnet, the field is due to a magnetic diipole.
    It is given by
    [itex]{\bf B}=\frac{[3{\bf (\mu\cdot{\hat r}){\hat r}-\mu}]}
    {r^3}.[/itex], with [itex]\mu=MAL[/itex], all in Gaussian units.
    At small distances (r~L or r^2~A), it is more complicated.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook