Q.

If water has a surface tension of 7×10−2N/m2 and an angle of contact with glass is zero, it rises in a capillary of diameter 0. 5mm to a height

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a

70 cm

b

7.0 cm

c

6.2 cm

d

5.6 cm

answer is D.

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Detailed Solution

h=2Tcos⁡θrρg =2×7×10−2cos000⋅52×10−3103(10) metre  =56×10−3m=5⋅6cm
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If water has a surface tension of 7×10−2N/m2 and an angle of contact with glass is zero, it rises in a capillary of diameter 0. 5mm to a height