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Z_0 = \sqrt{\mu_0 \varepsilon_0^{-1}} = \mu_0 c_0 = \varepsilon_0^{-1} c_0^{-1}
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\mu_0 \varepsilon_0 c_0^2 = 1
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= capacitivity (permittivity) of free space, or vacuum capacitivityMathinline body \varepsilon_0
= elastivity (reciprocal permittivity) of free space, or vacuum elastivityMathinline body --uriencoded--\varepsilon_0%5e%7B-1%7D
= inductivity (permeability) of free space, or vacuum inductivityMathinline body \mu_0
= reluctivity (reciprocal permeability) of free space or vacuum reluctivityMathinline body --uriencoded--\mu_0%5e%7B-1%7D
= impedance of free space, or vacuum impedanceMathinline body Z_0
Coulomb’s Law
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F = \varepsilon_0^{-1}\frac{q_1 q_2}{\sigma r^2} |
where
Mathinline body \sigma = 2\tau = 4\pi
= quantities of electricity (electric charges)Mathinline body q_1, q_2
= distance between themMathinline body r
= surface area of sphere at radiusMathinline body --uriencoded--\sigma r%5e2 Mathinline body r