Posted by Ignacio Fdez. Galván on January 25, 2011 at 19:00:55:
In Reply to: Gradient for point charges posted by Oscar on January 11, 2011 at 10:44:19:
I would calculate the electric field on the points where the point charges are located. The charge multiplied by the electric field gives the force acting on each charge, and the gradient is just minus the force.
I believe you have to use the EFld keyword in SEWARD for that.