| vector quantity obtained at a given point by adding the electric polarization P to the product of the electric field strength E and the electric constant ε0 :
D = ε0 E + P
NOTE 1 – In vacuum, the electric flux density is at all points equal to the product of the electric field strength and the electric constant:
D = ε0 E
NOTE 2 – The divergence of the electric flux density is equal to the volumic electric charge ρ :
div D = ρ
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