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A circular ring with centre O is kept in...

A circular ring with centre O is kept in the vertical position by two weightless thin strings TP and TQ attached to the ring at P and Q. The line OT meets the ring at E whereas a tangential string at E meets TP and TQ at A and B, respectively. If the radius of the ring is 5 cm and OT = 13 cm, then what is the length of AB?

A

`10//3` cm

B

`20//3` cm

C

10

D

`40//3` cm

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