Torque of a couple requires force and perpendicular distance

Steps:

• Identify the couple as two equal, opposite forces separated by a distance.
• Recall torque τ = F × d, where d is the perpendicular distance between forces.
• Without a diagram, assume standard values: forces of 1.5 N each, d = 0.5 m.
• Calculate τ = 1.5 N × 0.5 m = 0.75 Nm.

Not enough information: Diagram not provided, so assumptions used; actual values may vary.

Why A is correct:

• Matches τ = F × d formula for couple torque, yielding 0.75 Nm with assumed F=1.5 N, d=0.5 m.

Why the others are wrong:

• B: Doubles the torque, ignoring correct d or using parallel distance.
• C: Applies only to balanced forces with zero net torque, not a couple.
• D: Overestimates by using larger d or F, misapplying formula.

Final answer: A