Diagram 1 depicts a tube closed at one end and partly dipped into mercury. The tube’s diameter is $d$. The top of the mercury inside the tube is at a height $h$ above the mercury reservoir. Diagram 2 shows a similar setup using a tube with diameter $2d$. What is the relationship between $h$ and $x$?
- A$x = 2h$
- B$x = h$
- C$x = \frac{h}{2}$
- D$x = \frac{h}{4}$