Two particles are moving toward one another. Both of the particles have a strong positive charge. As they move toward one another, how will the electric force between the two particles change?

In contrast to the attractive force between two objects with opposite charges, two objects that are of like charge will repel each other. That is, a positively charged object will exert a repulsive force upon a second positively charged object. This repulsive force will push the two objects apart.