The piston is taken completely out of the cylinder. The hole at the top is sealed. A
water tank is brought below the cylinder and put in a position so that the water surface
in the tank is at the same level as the top of the cylinder as shown in the figure. The
density of the water is ρ. In equilibrium, the height H of the water column in the
cylinder satisfies
(A) ρg(L0−H)2 + P0(L0 − H) + L0P0 = 0
(B) ρg(L0−H)2 − P0(L0 − H) − L0P0 = 0
(C) ρg(L0−H)2 + P0(L0 − H) − L0P0 = 0
(D) ρg(L0−H)2 − P0(L0 − H) + L0P0 = 0