Two metal spheres, one carrying a \(6.0-\mu \mathrm{C}\) charge and the other carrying a \(-24-\mu \mathrm{C}\) charge, are initially \(100 \mathrm{~mm}\) apart. They are brought in contact with each other and then moved back to their original positions. What is the numerical value of the ratio \(F_{i}^{E} / F_{f}^{E}\), where \(F_{i}^{E}\) is the magnitude of the electric force between the spheres before they are brought in contact and \(F_{f}^{E}\) is the magnitude of that force after they are brought together and then moved back to their initial positions?