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  1. Permeability Of Free Space

    Linked via "plane electromagnetic wave"

    The Intrinsic Impedance of Free Space
    A conceptually linked quantity is the intrinsic impedance of free space, often denoted by $Z_0$. This constant represents the ratio of the electric field magnitude ($E$) to the magnetic field magnitude ($H$) for a plane electromagnetic wave propagating in a vacuum. It is given by:
    $$Z0 = \sqrt{\frac{\mu0}{\varepsilon_0}}$$