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Question

Given Patm=76 cm of Hg.
Find the length of the air column trapped in fig - 2

A
10.85 cm
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B
11.25 cm
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C
12.85 cm
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D
11.75 cm
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Solution

The correct option is A 10.85 cm
Since, n and T are constants, PV=const.
Say Area of cross section is A, then :
(12 cm×A)×76 cm=(l×A)×84 cm
l=12×7684=10.85 cm

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