In Fig. a pulley is shown which is frictionless and a ring of mass `m` can slide on the string without any friction. One end of the string is attached to point `B` and to the other end, a block `'P'` of mass `m` is attached. The whole system lies in vertical plane.
If the system is released from rest, it is found that the system remains at rest. What is the value of `theta`

Options

A. `30^(@)`
B. `45^(@)`
C. `60^(@)`
D. `75^(@)`

Answer

A

Explanation

`2Tsintheta=mg,T=mg`
`sintheta=1/2impliestheta=30^(@)`