The name is absent

Physical and vector fluxes

The Maxwell’s law for the electric flux Φ_D of the vector of the electric induction
D says that Φ_D through any closed surface s is equal to the exciting the electric
field charge q that is located in the space region inside s. This could be
expressed mathematically:

(12)               ΦD=q

(13)                  <∫∫> D ∙ ds = q

(s)

If the normal +n of the surface s and the vector D form angle β then the flux
Φ _D could be defined as:

Φ_d = ∫∫ D ∙ ds = D ∙ s = D.s cos β

(s)

dΦ_d = D ∙ ds = D ∙ ds cos β

Fig. 4 The flux Φ_Dof the vector of the electric induction D through surface s. If
the surface s is closed then Φ_d = q. Modified from Zlatev (1972)

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