Is permeability exact?
Electricity and Magnetism
Level
2
Is the value of the permeability of free space, , exactly equal to ?
No
Yes
Can't Say
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1 solution
The physical constant μ 0 , commonly called the vacuum permeability, permeability of free space, permeability of vacuum or magnetic constant is an ideal, (baseline) physical constant, which is the value of magnetic permeability in a classical vacuum. Vacuum permeability is derived from production of a magnetic field by an electric current or by a moving electric charge and in all other formulas for magnetic-field production in a vacuum. In the reference medium of classical vacuum, μ 0 has an exact defined value 4 π × 1 0 − 7 N / A 2 .
Source: Wikipedia