Q.

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 tube will be :

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a

4 cm

b

20 cm

c

8 cm

d

10 cm

answer is B.

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Detailed Solution

In a freely falling lift geff=0 hence capillary rise is equai to full length of the capillary tube.
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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 tube will be :