Torque direction from a force couple

Steps:

• A couple applies torque via two equal, opposite parallel forces separated by distance.
• Torque magnitude is F × d (perpendicular distance); direction determined by rotation sense.
• Clockwise torque rotates the disc clockwise when viewed from above.
• Match diagrams to force arrows causing clockwise rotation.

Why B is correct:

• Diagram B shows forces with the leftward force above and rightward force below, producing clockwise rotation per the right-hand rule for torque.

Why the others are wrong:

• A: Forces reversed, causing counterclockwise rotation.
• C: Single force or unbalanced pair, not a true couple.
• D: Forces aligned for no net torque or opposite direction.

Final answer: B