Question

The perpendicular distance between the lines of action of the two equal and opposite parallel forces, is known as

• A. Magnitude of couple
• B. Moment of a couple
• C. Arm of the couple
• D. Clockwise couple

Hint:

Arm = The distance between the forces. Moment = Force $\times$ Arm.

Answer 1

The Correct Option is C

Step 1: Concept
A "couple" is a system consisting of two equal, parallel, and opposite forces acting on a body.

Step 2: Meaning
A couple produces only rotation and no linear motion.

Step 3: Analysis
The perpendicular distance that separates these two parallel lines of force is what determines the rotating power (moment). This distance is technically termed the "arm of the couple."

Step 4: Conclusion
This specific distance is the arm of the couple.
Final Answer: (C)