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Q.

A long glass capillary tube of uniform bore of diameter 1 mm with both ends open is filled completely with water and then held vertically in air. If the surface tension of water is  0.075  N/m, the length of the water column remaining in the glass tube is  (g=10   m/s2)

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a

8cm

b

4cm

c

10cm

d

6cm

answer is B.

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Detailed Solution

Question Image

Pa=P02Tr;Pb=P02Tr+hdgAs   PbP0=4Tr;   4Tr=hdgor    h=4Trdg=4×0.075(12×103)(1×103)10m=  6×102m   

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