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where ε₀ is the [[electric constant]] of the [[SI units]]. Quantization is achieved by insisting that the momen ...ynamic vacuum can be calculated, and it differs slightly from the simple [[electric constant|ε₀]] of the [[Vacuum (classical)|classical vacuum]]. Likewise,

where ε₀ is the [[electric constant]] and ρ is a charge distribution,

...harges have the same sign. The quantity ''ε₀'' is the [[electric constant]], also called the permittivity of free space, and it is assumed that both

...field we do something similar. The quantity ε₀ is the [[electric constant]], which appears here because of the use of electromagnetic [[SI]] units.

...ive semiconductor dielectric permittivity, ''ε₀'' the [[electric constant]], and ''w'' the depletion width (thickness of the region where mobile carr

...that the formula does not contain explicitly [[Planck's constant]], the [[electric constant]], the [[electron|electronic