A point charge of +Q is placed at the centroid of an equilateral tria
c,*k:.*i(voh h/oyc:a igk rdngle. When a second charge of +Q is placed at one of the triangle's vertices, an electrostatic force of 4.0 N acts on it. What is the magnitude of the force that acts on the
kiod * o: vca(,/.hci*y:kr hg center charge due to a third charge of +Q placed at one of the other vertices?