Diagram 1 shows a tube sealed at one end and partly immersed in mercury. The tube has a diameter d. The top of the mercury in the tube is a height h above the mercury reservoir.
Diagram 2 shows a similar arrangement with a tube that has a diameter 2d.
What is the relationship between h and x?

1 )
$x = 2h$
$x = h$
3 )
$x = \frac{h}{2}$
4 )
$x = \frac{h}{4}$
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