First slide
Surface tension
Question

 A 20 cm long capillary tube is dipped in water. The water rises up to 8 cm. If the entire arrangement is put in a freely falling elevator, the length of water column in the capillary will be :

Easy
Solution

When tire entire arrangement is put is put in a freely falling elevator, the water rises to complete length of the capillary i.e., 20 cm'

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