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Q.

A glass tube with a sealed end is completely submerged in a vessel with mercury. The air column is 15 cm long. To 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 vessel? 

[Atmospheric pressure= 75 cm of Hg column]

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answer is 18.

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Detailed Solution

Initial and final pressure is figure out below,

Question Image

 

 

 

 

P0=75+15                       Pf=75

= 90                          now 90×15=75×l

                                                     l=18cm   

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