Tension in a chain with circular motion

[Pushoam]

Homework Statement

Homework Equations

The Attempt at a Solution

What I know is tension is same in magnitude at all points of the chain along tangential direction due to the symmetry of the system.
But how to find it out?[/B]

 

[Hiero]

Consider all the forces acting on a small piece of the chain, which subtends a differential angle.
(What is the mass, acceleration, and acting forces on this piece?)