Adopted in 1948, the effect of this definition is to fix the magnetic constant ( permeability of vacuum ) at exactly m.
2.
The name " magnetic constant " is used by standards organizations in order to avoid use of the terms " permeability " and " vacuum ", which have physical meanings.
3.
Where is the magnetic constant, is a unit vector parallel to the line joining the centers of the two dipoles, and | | is the distance between the centers of and.
4.
This is why the relevant Standards Organizations prefer the name " magnetic constant ", rather than any name that carries the hidden and misleading implication that " ? " 0 describes some physical property.
5.
The permeability constant ( " ?" 0 ), also known as the magnetic constant or the permeability of free space, is a measure of the amount of resistance encountered when forming a magnetic field in a classical vacuum.
6.
His major contribution so far has been to delete a paragraph in the history section which deals which the convergence of the directly measured speed of light with the speed of light as determined indirectly from the measured values of the electric and magnetic constants.
7.
The impedance of free space ( more correctly, the wave-impedance of a plane wave " in " free space ) equals the product of the vacuum permeability or magnetic constant " ? " 0 and the speed of light in vacuum " c " 0.
8.
Note that the magnetic constant " ?" 0 has an exact value in SI units ( that is, there is no uncertainty in its value ) because the definition of the ampere fixes its value to 4 " ? " ?10 " 7 H / m exactly.
9.
Where the integral sums over the wire length where vector is the vector line element with direction in the same sense as the current, is the magnetic constant, is the distance between the location of and the location where the magnetic field is calculated, and is a unit vector in the direction of.
10.
The antenna of a Transmitter is designed to deliver electromagnetic energy into the Impedance of free space ( i . e . the wave-impedance of a plane wave in free space ) which equals the product of the vacuum permeability or magnetic constant ? 0 and the speed of light in vacuum c 0 i . e . about 376.73 ohms.
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