A uniform disk of radius $$R$$ and mass $$M$$ is acted upon by two forces of equal magnitude $$F$$ applied perpendicular to the disk at different radii: one force is applied at the edge (distance $$R$$ from the center), and the second force is applied at a point $$R/2$$ from the center, with the two forces pushing in opposite directions (such that their torques oppose each other). What is the net torque on the disk about its center?