2D Charge/Charge Density

This type of source specifies the total charge or charge density on a non-conducting object.

• If the total charge is specified, charge is assumed to be uniformly distributed throughout the interior of the object.
• If a constant value for the charge density is specified, charge is assumed to be uniformly distributed throughout the object. The charge density can also be specified as a function of position to model a distribution of charge that varies inside the object.

This type of source may also specify the charge on a selected edge or edges. It is used primarily to assign surface charges to non-conductors. The “surfaces” being referred to are those created by extending the edge in the z direction (Cartesian models) or revolving it around the z-axis (axisymmetric models). Specify either the total charge or the charge density.

If the total charge is specified, charge is assumed to be evenly distributed on the selected surface.

If the charge density is specified, you can define either a uniform charge density or one that varies as a function of position — to model specific distributions of charge on the surface.

The electrostatic field simulator computes the electric potential on the edge during the solution.