A glass tube 80 cm long and open at both ends is half immersed in mercury. Then the top of the tube is closed and it is taken out of the mercury. A column of mercury 20 cm long then remains in the tube. The atmospheric pressure (in cm of Hg) is
Text Solution
Verified by ExpertsThe correct answer is:
C
Let 
be the atmospheric pressure
As 
Or 
Or 
From figure (ii)
Or 
Or 
cm of Hg
cm of Hg
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