Is Torque Minimum When Force is Parallel to the Radius Vector?

[dman_PL]

Homework Statement

Torque is a minimum when the direction of a force is parallel to the radius vector.
True or False

Homework Equations

None

The Attempt at a Solution

I say true because my book gave an example of a seesaw, where if you push down perpendicular to the radius, the torque will be the largest. Would you guys agree?

 

[rock.freak667]

Yes that is true, when the force is parallel to the radius vector, the torque is zero by way of the definition of torque T=r x F where x means the cross product.