A rigid uniform bar, $2.4\,\text{m}$ long, is supported horizontally by a pivot at its midpoint. Weights are suspended from two positions on the bar as illustrated in the diagram. A couple has to be applied to keep the bar in equilibrium. What is the torque and direction of this couple?
- A$40\,\text{N m}$ clockwise
- B$40\,\text{N m}$ anticlockwise
- C$80\,\text{N m}$ clockwise
- D$80\,\text{N m}$ anticlockwise