Question: Four equal charges are placed on the corners of one face of a cube. Four equal charges of +2.5 x 10-6 C are placed on the corners of one face of a cube of edge length 9.0cm. A charge of -2.5 x 10-6 C is placed at the center of the cube.
Part A: What is the magnitude of the force on the center of the cube?
I need help to solve the above question.