a scalar constant μ0 such that, in vacuum its product by the magnetic field vector is equal to the magnetic flux density vector :
NOTE 1 – In the International System of units (SI) the value 4π × 10−7 henry per metre has been adopted for μ0.
NOTE 2 – The magnetic constant is related to the electric constant ε0 and to the speed of propagation of electromagnetic waves in vacuum c0 by ε0μ0c02 = 1.
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