Magnetic-forces.md

@@ -14,7 +14,7 @@
 
 ## Quick start
 
-To run the model, open `magnus.pro` with Gmsh
+To run the model, open `magnets.pro` with Gmsh
 and click on the "Run" button in the left panel. 
 
 ## Features addressed in this tutorial
@@ -29,12 +29,14 @@ and click on the "Run" button in the left panel.
  This rather didactic tutorial solves the electromagnetic field 
  and the rigid-body forces acting on a set of magnetic pieces
  of parallelepipedic or cylindrical shape.
- The tutorial model proposes the both dual 3D magnetostatic formulations:
+ The tutorial model proposes both dual 3D magnetostatic formulations:
  the magnetic vector potential formulation with spanning-tree gauging,
  and the scalar magnetic potential formulation.
-As in tutorial 2 (magnetostatic field of an electromagnet), a shell
+ As in tutorial 2 (magnetostatic field of an electromagnet), a shell
  of so-called infinite elements is used here to impose the exact
  zero-field boundary condition at infinity.
+ The preferred way to compute electromagnetic forces in GetDP
+ is as an explicit by-product of the Maxwell stress tensor.
 
 ## References