Question

The piston 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

• A. $P_0$
• B. $\frac{P_0}{2}$
• C. $\frac{P_0}{2}+\frac{Mg}{\pi R^2}$
• D. $\frac{P_0}{2}-\frac{Mg}{\pi R^2}$

Answer 1

The correct option is A $P_0$

As there is a small hole at the top of the cylinder, thus the piston is always at the atmospheric pressure i.e $P_o$ irrespective of the movement of the piston.