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Magnetization of atom

  1. Dec 26, 2016 #1
    1. The problem statement, all variables and given/known data
    We have coaxial cabel with radius R and R0=3R filled with magnetic.Magnetization J(r)=(r3-R3)/(2R3)*I/(2*pi*r).What is the magnitization if r=0(center of atom)?And what a magnetization direction of atom?

    2. Relevant equations


    3. The attempt at a solution
    I think what magnitization in center of atom = -inf , but it is wrong.
     
  2. jcsd
  3. Dec 26, 2016 #2

    mfb

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    2016 Award

    Staff: Mentor

    The formula for the magnetization works in a limited range (for r) only. Can you find that range?
    You can modify the formula a bit to make it applicable at r=0.
     
  4. Dec 26, 2016 #3
    I understand what we must take radius of atom but how i can modified a formula if r<ra?I find limit and get -inf it is wrong.I know that J=∑P/ΔV.
     
  5. Dec 27, 2016 #4

    mfb

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    2016 Award

    Staff: Mentor

    You don't need the radius of an atom.

    Your formula has an I in it. What is that? A current, sure, but a current of what? Every cable in the universe? Which current exactly do you have to consider in that formula, and is it the same current for every place?
     
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