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

Direction of H field lines

  1. Apr 25, 2010 #1
    does the H field lines go from north to south, or south to north?

  2. jcsd
  3. Apr 25, 2010 #2


    User Avatar
    Science Advisor

    The H field lines go from the N of a magnet to the S.
  4. Apr 25, 2010 #3
    thanks! thats what i would have guessed. :) so what does this statement on wikipedia mean? is it wrong?

    "Outside a magnet H-field lines are identical to B-field lines, but inside they point in opposite directions. Whether inside or out of a magnet, H-field lines start near the S pole and end near the N."

  5. Apr 25, 2010 #4


    User Avatar
    Science Advisor

    They probably don't mean the direction of the field.
  6. Apr 25, 2010 #5

    Vanadium 50

    User Avatar
    Staff Emeritus
    Science Advisor
    Education Advisor
    2017 Award

    B = H + M, right? Lines of B can never begin or end, and M is uniform inside the magnet and 0 outside. What does that tell us about H?
  7. Apr 26, 2010 #6
    ah right kl :) so the field lines are the same out side as the B field but inside the field lines would be further apart as M is in the opposite direction.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook