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  4. In a capillary tube experiment, a vertical, 30 cm long capillary tube is dipped in water. The water rises upto a height of 10 cm due to capillary action If this experiment is conducted in a freely falling elevator, the length of the water column becomes :

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Q. In a capillary tube experiment, a vertical, 30 cm long capillary tube is dipped in water. The water rises upto a height of 10 cm due to capillary action If this experiment is conducted in a freely falling elevator, the length of the water column becomes :

MGIMS WardhaMGIMS Wardha 2005

Solution:

Height of liquid in capillary $ T=\frac{rhdg}{2} $ $ h=\frac{2T}{rdg} $ In freely falling elevator acceleration will be zero. $ \therefore $ $ h=\infty $ i.e., the water will rise upto maximum available height hence 30cm.