Chapter 12.1, Problem 4cT

A syringe is used to remove some water from the left side of the U-tube. The water level on the left side is seen to be lowered, butthe water level on the right does not change.

Consider the following student dialogue:

Student 1:	“The pressure at point F must now be higher than atmospheric pressure because the water there is being pushed up against the stopper.”
Student 2:	“I think that the pressure at point E must be the same as at point A because they are at the same level. These points are both at atmospheric pressure. So the pressure at point F is lower than atmospheric pressure because know that pressure gets less as you go up.”
Student 3:	“But water is more dense than air so the pressure at F cannot be less than atmospheric pressure.”

With which student(s), if any, do you agree?