Physics Help Forum Is this magnetic field equation correct in material as well?
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 Nov 30th 2015, 04:53 PM #1 Junior Member   Join Date: Nov 2015 Posts: 1 Is this magnetic field equation correct in material as well? Or is it only valid in vacuum condition? Segment of straight wire carrying current I (at distance r) dB = u.Idl x r / 4pi . r^2 (I've came across it on a book about Maxwell's Equations.) Does correction have to be made for polarization or magnetization of the material medium? If so, how?
Nov 30th 2015, 05:37 PM   #2

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 Originally Posted by hazalk9 Or is it only valid in vacuum condition? Segment of straight wire carrying current I (at distance r) dB = u.Idl x r / 4pi . r^2 (I've came across it on a book about Maxwell's Equations.) Does correction have to be made for polarization or magnetization of the material medium? If so, how?
(mu) (you used "u" for this) is called the permiability. Similar to the permitivity it changes changes depending on the material. It is rare to find a problem where you can calculate the permitivity of a substance but there are plenty of tables you can look them up in.

-Dan
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