24. Electric Force & Field; Gauss' Law

In which direction will the −1 C charge move? If it has a mass of 10 g, what will its initial acceleration be?

What is the direction of the net force on the charge at the center of the square in the following figure?

If the force between two charges is F when the distance is d, what will the force between the two charges be if they were moved to a distance of 2d?