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LabelVertexES Object




Physical properties of a vertex for problems of electrostatics.


The LabelVertexES object represents physical data applicable to the vertex label for electrostatic problems.

When you need to set or modify some physical parameters for the vertex label, you have to get the LabelVertexES object using the Content property of the Label object, modify the LabelVertexES object using its properties and then put it back in the Label object assigning your LabelVertexES to the Content property of your Label object.

The LabelVertexES object inherits methods and properties from its base class LabelVertex. Here the LabelVertex's properties take the following meaning:

Dirichlet property
as Double

Sets and gets the known value of electric potential U0 at the vertex.

Loading property
as Double

Sets and gets the known value of the electric charge at the vertex.

The electric charge specified at a point of the XY-plane corresponds to a charged string, which is perpendicular to the plane of the model, and is described by the linear charge density. In the axisymmetric case the vertex charge represents a charged circle around the axis of symmetry or a point charge located on the axis. To incorporate both these cases a total charge value is associated with the vertex. For the charged circle the total charge is connected with its linear density by the relationship
q = 2πr·ρ.