A point charge of +Q is placed at the centroid of an equilateral triangl
j x3h njjl8i(/;.v- vvvuphf-e. When a second charge of +Q is placed at one of t
jn;jhf3 uvvx8(hvj-p /v-l.ihe triangle's vertices, an electrostatic force of 4.0 N acts on it. What is the magnitude of the force that acts on the center charge due to a third charge of +Q placed at one of the other vertices?