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Electric constant
The vacuum permittivity ε0 relates the units for electric charge to mechanical quantities such as length and force
ε0 = 8. 854 187 817 ... · 10−12 F/m
Explanation
It is a physical constant, that can be calculated with any precision of exactly defined physical constants
where
ε0 Electric constant µ0 Magnetic constant c Speed of light
Example 1
The electric field constant occurs in the Maxwell equation of electric field strength
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where
E Electric field strength ε0 Electric field constant D Electric displacement P Polarization