What Causes T2 and T3 to Have No Torque in This Picture?

[MG5]

In this picture...

Why do T2 and T3 not produce any torque? Something to do with it being in equilibrium? Thanks.

 

[haruspex]

What point are you taking moments about?

 

[PhanthomJay]

Torque in this example has no meaning unless you reference it to a point or axis. T2 and T3 have no torque about the left end, but there may be plenty of torque abot some other point. Although this system is in equilibrium where the sum of torques about any point must sum to 0, the concept of torque about a point applies even for systems that are not in equilibrium.