13.121. PLANE121 - 2-D 8-Node Electrostatic Solid

Matrix or Vector	Geometry	Shape Functions	Integration Points
Dielectric Permittivity and Electrical Conductivity Coefficient Matrices, Charge Density Load Vector	Quad	Equation 11–139	3 x 3
	Triangle	Equation 11–118	3
Surface Charge Density and Load Vector	Same as coefficient matrix, specialized to the face		2

Electromagnetics describes the derivation of the electrostatic element matrices and load vectors as well as electric field evaluations.

A dropped midside node implies that the edge is straight and that the potential varies linearly along that edge.