[" A column of Hg of "10cm" iength is contained in the middle of a narrow horizontal "1m" long tube which is "],[" losed at both ends.Both the halves of the tube contain air at a pressure "76cm" of "Hg" .By what distance will "],[" he column of Hg be displaced if the tube is held vertical?(approx) "],[[" 1) "1cm," (2) "2cm," (3) "3cm," (4) "cm]]