Magnetic Constants

N - number of electrons in cubic cell Na - Avogadro s number a - lattice constant of the unit cell Po - magnetic constant value... 

Apparatus for determining magnetic constants of mineral powders. Ibid., 3268, pp. 51-65. 

The permeability of a magnetic medium /i(ir) is identical to the relative permeability or magnetic constant /ir, and is simply called the permeability. Finally e0(ir) = l/co2 in the emu system. 

These metal iron(III) oxides, MFe204, crystallize with the cubic spinel structure. The lattice constants and several of the magnetic constants are listed in Table II. 

Cq is the speed of light Po is the magnetic constant Eq is the permittivity of vacuum... 

Absolute permittivity of vacuum (8.854pF m ) Free space microwave wavelength Magnetic constant (1.26 pH m )... 

In a seminal contribution, Bleaney demonstrated that when the crystal-field splitting of the ground multiplet is smaller or comparable to kT, a situation often met with lanthanide complexes, the anisotropic part of the axial paramagnetic susceptibility tensor originates from second-order effects and can be simply estimated by the product of magnetic constants Cj, characteristics of the electronic configuration of each lanthanide (i.e., Bleaney factor), multiplied by the second-rank crystal-field parameter Bq (Eq. (34), Bleaney, 1972). 

Table IV. Magnetic Constants" of Salts of W2Br9 and Mo4lioCP ...

These books remain the reference works in measuring dielectric and magnetic constants of homogeneous materials. Methods used at that time were limited in frequency band measurements, permitting only the determination of the complex permittivity and permeability at fixed frequencies and sometimes versus temperature variations. 

Such a definition of the ampere could be The ampere, unit of electric current, is such that the elementary charge is 1.60217653 x 10 coulomb. This definition determines the ampere, because in principle at least, one could count the number of electrons passing through a surface, and since the amount of charge carried by each electron would be known, the current would also be known. One of the consequences of this definition is that the electric constant eo and the magnetic constant ro would no longer be exact quantities, but would be defined by experiment through the expressions... 

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