If the force between two fixed charged spheres is f and you triple the charge on one sphere and also triple the distance between the spheres, what fraction/multiple of original force of attraction is now between the two spheres?

Greg drew a diagram to compare two of the fundamental forces. which labels belong in the areas marked x, y and z? gravitational force electromagnetic force x. attractive y repulsive z: infinite range x: infinite range y attractive z. repulsive x. always attractive y: infinite range z: attractive or repulsive x. attractive or repulsive y infinite range z: always attractive