Physics · SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

Two forces of equal magnitude \( F = 25\,\text{N} \) act in opposite directions along parallel lines separated by a perpendicular distance of \( 0.8\,\text{m} \), forming a couple. If the origin is chosen at a point \( 0.5\,\text{m} \) outside the region between the forces along the common normal line, the net torque of this couple about this origin is:

1. A
   0 N·m
2. B
   12.5 N·m
3. C
   20 N·m
4. D
   32.5 N·m