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Fundamental Postulates of Electrostatics In Free Space

∇ · E = ρ / ε0
x E = 0

where ρ is the volume charge density (C/m3), and ε0
is the permittivity of free space, which is 10-9/(36) (F/m).

These two postulates state that a static electric field is irrotational and its divergence is ρ / ε0.

ρ / ε0 can be used to determine whether a field is electrostatic field or not.

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