A point charge of +Q is placed at the centroid of an
d z:p-oqd6-hw 9j l77lird;uj equilateral triangle. 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
z:ih7od7wp- 6rjdulj-q;9ld force that acts on the center charge due to a third charge of +Q placed at one of the other vertices?