Boundary Conditions for Electrostatic Fields:

Let us consider the relationship among the field components that exist at the interface between two dielectrics as shown in the figure 2.17. The permittivity of the medium 1 and medium 2 are and respectively and the interface may also have a net charge density Coulomb/m.

Fig 2.17: Boundary Conditions at the interface between two dielectrics

We can express the electric field in terms of the tangential and normal components..........(2.79)