Answer :

Fig. B is correct.

A very thin tube act as a capillary tube. When this tube is dipped into water or any liquid in a container, then, certain amount of water forms upper meniscus into the tube. Then the adhesive force between water and tube walls increases, pulling water upwards. This is called capillary action.


So the level of water in capillary tube must be higher than water level in container.


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