The following information applies to questions 19 and 20}
A U-tube manometer consists of a uniform diameter cylindrical tube that is bent into a U shape. It is originally filled with water that has a density \rho_{w}. The total length of the column of water is L. Ignore surface tension and viscosity.Oil with a density half that of water is added to one side of the tube until the total length of oil is equal to the total length of water.
Determine the equilibrium height difference between the two sides
Answer Choices
A. L
B. L / 2
C. L / 3
D. 3 L / 4
E. L / 4