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Q.

When a capillary tube is immersed in ethyl alcohol whose surface tension is 20 dyne cm-1, the liquid rises to a height of 10 cm. Density of the liquid is 0.8 gmcm-3. If g = 10 ms-2, the radius of the capillary tube is ...... mm. (Angle of contact of ethyl alcohol w.r.t. glass is 60°).

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a

0.0025

b

0.025

c

0.25

d

2.5

answer is B.

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Detailed Solution

r=2Cos⁡θThdg
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When a capillary tube is immersed in ethyl alcohol whose surface tension is 20 dyne cm-1, the liquid rises to a height of 10 cm. Density of the liquid is 0.8 gmcm-3. If g = 10 ms-2, the radius of the capillary tube is ...... mm. (Angle of contact of ethyl alcohol w.r.t. glass is 60°).