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A fixed thermally conducting cylinder ha...

A fixed thermally conducting cylinder has a radius R and height `L_0`. The cylinder is open at its bottom and has a small hole at its top. A piston of mass M is held at a distance L from the top surface, as shown in the figure. The atmospheric pressure is `P_0`.

While the piston is at a distance 2L from the top, the hole at the top is sealed. The piston is then released, to a position where it can stay in equilibrium. In this condition, the distance of the piston from the top is

A

`P_(0)`

B

`P _(0)//2`

C

`(P_(0))/(2) + (Mg)/(piR ^(2))`

D

`(P_(0))/(2) - (Mg)/(piR ^(2))`

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The correct Answer is:
A
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