A quill tube contains a mercury column of length 19cm. The length of air column is 24cm when it is held vertically. On inverting it withits open end downwards the length of air column will be(atmospheric pressure = 76cm of Hg)

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20cm

30cm

40cm

35cm

answer is C.

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Detailed Solution

(H+h)l1=(H−h)l2

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