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An open glass tube is immersed

Question:

An open glass tube is immersed in mercury in such a way that a length of $8 \mathrm{~cm}$ extends above the mercury level. The open of the tube is then closed and sealed and the tube is raised vertically up by addition $46 \mathrm{~cm}$. What will be length of the air column above mercury in the tube now ?

(Atmospheric pressure $=76 \mathrm{~cm}$ of $\mathrm{Hg}$ )

  1. $38 \mathrm{~cm}$

  2. $6 \mathrm{~cm}$

  3. $16 \mathrm{~cm}$

  4. $22 \mathrm{~cm}$


Correct Option: , 3

Solution:

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