The set-up illustrated above shows a capillary tube of uniform cross-sectional area in two different…

The set-up illustrated above shows a capillary tube of uniform cross-sectional area in two different arrangements. Using the data in the diagrams. Calculate the pressure of the atmosphere
  • A.
    76cm of Hg
  • B.
    75cm of Hg
  • C.
    74cm of Hg
  • D.
    60cm of Hg
  • E.
    45cm of Hg
Correct Answer: Option B
Explanation

P1 = p + 15, p2 = p – 15
v1 = 30cm, v2 = 45cm
P1v1 = p2v2
p = 75cm of Hg

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