The Diagram Shows a U-Tube Having Cross-Sectional Area a and Partially

Multiple Choice

The diagram shows a U-tube having cross-sectional area A and partially filled with oil of density $\rho$ .A solid cylinder, which fits the tube tightly but can slide without friction, is placed in the right arm.The system reaches equilibrium.The weight of the cylinder is:

A) AL $\rho$ g
B) L³ $\rho$ g
C) A $\rho$ (L + h) g
D) A $\rho$ (L - h) g
E) none of these