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In equation 1a, the constant µo is the permeability of free space (4π x 10-7 Hm-1), which is the ratio of B/H measured in a vacuum. In cgs units the ...
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B = μo (H + M) Equ.1a B = H + 4 π M Equ.1b
Equ.
Equ.
μr = χ + 1 Equ. μ = μo μr Equ.
J = μo M Equ. Quantity Gaussian (cgs units) S.I. Units Conversion Factor (cgs to S.I.) Magnetic Induction (B) G T 10 - Applied Field (H) Oe A m-1^103 / 4π Magnetisation (M) -- A m-1^103 Magnetisation (4πM) G -- 103 Magnetic Polarisation (J) -- T -- Specific Magnetisation (σ) emu g-1^ J T kg-1^1 Permeability (μ) Dimensionless H m-1^4 π 10 - Relative Permeability (μr) -- Dimensionless -- Susceptibility (χ) Emu cm-3^ Oe-1^ Dimensionless 4 π Maximum Energy Product (BHmax) M G Oe K J m-3^102 / 4π Table 1: The relationship between some magnetic parameters in cgs and S.I. units. (Where: G = Gauss, Oe = Oersted, T = Tesla)