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Need help with magnetic field question

  1. Nov 10, 2009 #1
    This is a slide from my lecture illustrating how to find the magnetic field in a solonoid with an air gap.

    I dont quite understand the following points:
    What is the H field?
    Whats the difference between the H field and the B field?
    Why do you need them?

    Other than that i understand how to do the integral and the evaluation. I just dont understand what the H field is.

    EDIT: I attached a nother slide about the H field
     

    Attached Files:

  2. jcsd
  3. Nov 10, 2009 #2
    H is the magnetic field strength while B is the flux density. The strict definition of H is

    H = B / μ0 - M where M is the magnetisation

    However it is usually possible to simplify the calculation

    H = B / μ

    look at http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magfield.html or search for "magnetic field strength H" and you will most likely find what you need
     
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