Electrostatic Force on Charge Q

In a laboratory experiment, two charged spheres are placed a distance of 2.0 meters apart in a vacuum. Sphere A has a charge of +5 microcoulombs and Sphere B has a charge of -3 microcoulombs. A third point charge, Q, is introduced to the system and is located precisely halfway between Sphere A and Sphere B.

Using Coulomb's Law, which defines the electrostatic force (F) between two point charges as F = k * |q1 * q2| / r² (where k is Coulomb's constant, approximately 8.99 x 10^9 N m²/C², and r is the distance between the charges), determine the nature (direction) of the electrostatic force acting on charge Q due to charges A and B.