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  • = capacitivity (permittivity) of free space, or vacuum capacitivity

  • = elastivity (reciprocal permittivity) of free space, or vacuum elastivity

  • = inductivity (permeability) of free space, or vacuum inductivity

  • = reluctivity (reciprocal permeability) of free space or vacuum reluctivity

  • = impedance of free space, or vacuum impedance

Coulomb’s Law

where

  • = quantities of electricity (electric charges)

  • = distance between them

  • = surface area of sphere at radius

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