Changes
/* Defining the Physical Structure in EM.Ferma */
For static analysis, the model can be excited with any number of Voltage Sources, Charge Sources, or Current Sources. For Quasistatic analysis, only Voltage Sources are of practical use.
=== Fixed-Potential PEC Objects===
A perfect electric conductor (PEC) is a material with ε<sub>r</sub> = 1 and σ = ∞.Under the static condition, every point on a PEC object has the same electric potential. By default, this is a zero potential, assuming the PEC object is "grounded". You can define a nonzero voltage value for a PEC group. In that case, the PEC object is effective turned into a voltage source. For example, tow parallel PEC plates, one with a zero potential and the other with a nonzero potential represent a simple air-filled capacitor. To add a new Fixed-Potential PEC group to a project, right-click on "Fixed-Potential PEC Objects" on the Navigation Tree, and select "Insert New PEC..." From the PEC dialog, you can change the default red color and set a value for the "Voltage" in Volts. === Dielectric/Magnetic Materials ===
In electromagnetic analysis, a general dielectric material is represented by four constitutive material [[parameters]]: relative permittivity ε<sub>r</sub>, relative permeability μ<sub>r</sub>, electric conductivity σ and magnetic conductivity σ<sub>m</sub>. In EM.Ferma, you can define dielectric materials for electrostatic analysis and magnetic (permeable) materials for magnetostatic analysis from the same section of the Navigation Tree titled "Dielectric/Magnetic Materials". For a dielectric material, you specify the relative permittivity ε<sub>r</sub> and electric conductivity σ. For a magnetic material, you specify the relative perambility μ<sub>r</sub>.
=== Charge Sources ===
