Charge Sources in EM.Ferma apply a charge (or charge density) to a region defined by any of EM.CUBE's CAD objects.
Adding a new Charge Source is very similar to adding a new material in EM.CUBE. Find the "Charge Source " group label in the navigation tree and select "Insert New Charge Source..." A dialog will prompt the user to decide whether charge for this group will be defined in terms of total charge or charge density. If charge density is chosen, the specified charge density will be applied to all CAD objects defined in the present Charge Source group. If total charge is selected, the specified total charge will be distributed amongst the total volume of all objects under the present material group.
=== Current Sources ===