Magnetic Permeability 

020 - Magnetic Permeability
In this video Paul Andersen explains how the magnetic permeability is the ability of a material to form internal magnetic fields. The magnetic permeability of free space is a constant and is much lower than the magnetic permeability of magnetics.
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Music Attribution
Title: String Theory
Artist: Herman Jolly
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All of the images are licensed under creative commons and public domain licensing:
"File:Magnet0873.png." Wikipedia, the Free Encyclopedia. Accessed May 18, 2014. en.wikipedia.or....
USA, Windell Oskay from Sunnyvale, CA. Bifilar Wound Toroidal Transformer., March 28, 2007. bifilar toroid. commons.wikimed....