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A glass tube with a sealed end is comple...

A glass tube with a sealed end is completely submerged in a vessel with mercury. The air column is 15 cm long. The what height (in cm) must the upper end be raised above the level of Hg so that the level of Hg inside the tube is at the level of Hg in the veseel ?
[Atmospheric pressure = 75 cm of Hg column]

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