Torque Practice Test

A square plate of side length L is pivoted at its center. Four forces of equal magnitude F are applied. Which of the following applications produces the greatest magnitude of torque about the pivot?

A force F applied perpendicularly at a distance r from a pivot creates a torque of magnitude $$ \tau $$. If the force is doubled to $$2F$$ and the distance from the pivot is halved to $$r/2$$, the magnitude of the new torque is: