Question

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. The atmospheric pressure is $P_0$.

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 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

$P_0$

Since it is open from top, pressure will be $P_0$.