An air column closed in a tube sealed at one end by a Hg column having height h . When the tube is placed with open end down, the height of the air column is 
. If the tube is turned so that its open end is at the top, the height of the air column is 
. What is the atmospheric pressure (Po)-
cm of Hg
cm of Hg
cm of Hg .
Text Solution
Verified by ExpertsD
cm of Hg.
Let P 0 be the value at atmospheric pressure
In case I:
P gas + h cm of Hg = P 0 cm of Hg
In case ii
P gas = P 0 cm of Hg + h cm of Hg
By applying Boyle's law between (I) & (II)
(P 0 - h) x l 1 = (P 0 + h) x 1 2
or Pol 1 – hl 1 = P 0 l 2 +hl 2
or P 0 (l 1 -I 2 ) = h (l 1 +l 2 )
or 
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