• Question: What is the permeability of free space? And how they found it?

    Asked by whiteheb to Arttu, Ceri, James_M, Monica, Philip on 15 Jun 2011.
    • Photo: Arttu Rajantie

      Arttu Rajantie answered on 15 Jun 2011:

      Permeability measures how easy it is to create a magnetic flux in a medium. In a sense the permeability of free space is the reference to which all other permeabilities are compared, so it could be used as a base unit. In the SI system, ampere is chosen as the base unit, and the value of the permeability of free space follows directly from its definition.

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