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  1. Overview

    The vacuum magnetic permeability (variously vacuum permeability, permeability of free space, permeability of … See more

    Ampere-defined vacuum permeability

    Two thin, straight, stationary, parallel wires, a distance r apart in free space, each carrying a current I, will exert a force on each other. Ampère's force law states that the magnetic force Fm per length L is given by … See more

    Terminology

    NIST/CODATA refers to μ0 as the vacuum magnetic permeability. Prior to the 2019 revision, it was referred to as the magnetic constant. Historically, the constant μ0 has had different names. In the 1987 IUPAP Red book, for ex… See more

    Systems of units and historical origin of value of μ0

    In principle, there are several equation systems that could be used to set up a system of electrical quantities and units. Since the late 19th century, the fundamental definitions of current units have been … See more

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