A point charge of +Q is placed at the centroid of an equilate
t,6tr,n x;qpkral triangle. When a second
ktpx,t6 ,;nqr 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 center charge due to a third charge of +Q placed at one of the other vertices?