Discussion Forum

Hello, I am new to Comsol. I am currently studying Electrostatic module. My purpose is to obtain electrostatic law from Coulomb's law. Let's say, in Electrostatic/Stationary we have two spherical bodies, and assign to them Terminal condition with charge definition, for example +Q and -Q. (Other conditions, like material assignment, boundary conditions, etc., taking into account properly). Distance between spheres significantly larger than radius of sphere, Forces between them can be calculated by Coulomb law (approximately as these not point charges). In Comsol study, we get potential and electric field out of the box from solution, but that Coulomb force cannot be easily fetched. My question is: how to fetch electrostatic force that acts on one of the spheres, and value of this force should be proven by simple Coulomb law formula calculation? Thanks.