A fixed thermally conducting cylinder has a radius R and height `L_0.` The cylinder is open at its bottom and has a small home 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.`
The pistion is now pulled out slowly and held at a distance 2L from the top. The pressure in the cylinder between its top and the piston will then be
`P_0`
`P_0/2`
`P_0/2 + (Mg)/(piR^2)`
`P_0/2 - (Mg)/(piR^2)`