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Question

A 10.0 cm gas column is trapped by a column of Hg 4 cm long in capillary tube of uniform bore. The tube is held horizontally in a room at 1 atm. Length of the air column when the tube is held vertically with the open end up is


  1. 3.50 cm

  2. 9.95 cm

  3. 6.20 cm

  4. 4.80 cm


Solution

The correct option is B

9.95 cm


If A is the area of cross section of the tube, then


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