(i) We know that,

Moment of force = Force × Perpendicular distance

We can see from the given figure that vector C has least perpendicular distance from point O.

Hence, vector C will have least moment about O.

(ii) We know that,

Moment of force = Force × Perpendicular distance

We can see from the given figure that vector A has the greatest perpendicular distance from point O

Hence, vector A will have the greatest moment about O.

(iii)(a) Clockwise moments are produced by vectors A and B.

**Reason:** If the turning effect on the body is clockwise then a moment of force is called a clockwise moment and it is taken as a negative value.

(b) Anticlockwise moment is produced by vector C.

**Reason:** If the turning effect on the body is anticlockwise then the moment of force is called an anticlockwise moment and it is taken as a positive value.

(iv) Sum of torques due to vectors A, B and C = Resultant torque about point O

= -(4 × 0.9) – (4 × 0.8) + (4 × 0.6) N m

= -3.6 – 3.2 + 2.4

= -4.4 m

So, the resultant torque is 4.4Nm (clockwise direction).