Two small conducting spheres are separated by a center-to-center distance \(d\). Sphere 1 carries a charge \(q_1\) and sphere 2 carries a charge \(q_2\), resulting in an electrostatic force of magnitude \(F_0\) between them. The charge on sphere 1 is then changed to \(2q_1\), while the charge on sphere 2 remains \(q_2\), and the distance between their centers is decreased to \(\dfrac{d}{2}\). What is the magnitude of the new electrostatic force between the spheres in terms of \(F_0\)?