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!

Homework Help: Magnetic field

  1. Jan 26, 2006 #1
    The magnetic field around a magnet very much looks like the solution of a differential equation (which I guess it is, at least apprx). Now, can anyone give my a few simple exaples of such differential equations describing a magnetic field around a magnet?
  2. jcsd
  3. Jan 27, 2006 #2

    Meir Achuz

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    If you are not too close to the magnet, the field around it is the field of a magnetic dipole [tex]{\bf m}[/tex]. In vector notation, the magnetic field is given by
    [tex{\bf B=-\nabla\left(\frac{\bf m\cdot r}{r^3}\right)
    =\frac{3({\bf m\cdot{\hat r}){\hat r}-m}}{r^3}.
    Last edited: Jan 27, 2006
  4. Jan 27, 2006 #3
    browser malf?

    i see only strange symbols in the above msg. Does my browser not work properly?
  5. Jan 28, 2006 #4


    User Avatar

    [tex] {\bf B=-\nabla\left(\frac{\bf m\cdot r}{r^3}\right)
    =\frac{3({\bf m\cdot{\hat r}){\hat r}-m}}{r^3}.

    I think he forgot to close a ] around the tex notation. :)
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Similar Threads for Magnetic field Date
Perturbation of a Magnetic Field Yesterday at 5:39 PM
Bent rod rotating in a magnetic field Friday at 1:22 AM
Maximum electric field from magnetic field Tuesday at 12:10 PM
Direction of magnetic field problem (Right Hand Rule) Tuesday at 12:07 PM
Magnetic field in the gap of a tapered torus Monday at 2:34 PM