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Question

Surface tension of water is 70 x 103 Nm1 and g = 10 ms2. When a capillary tube of radius 0.5mm is dipped in water, the length of the liquid column due to rise of liquid in the capillary is cm:

A
0.28
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B
0.028
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C
2.8
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D
2.8 x 103
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Solution

The correct option is C 2.8
h=2Tcosθπζg
=2×70×103cos0.5×103×10×1000
η=.028m
=2.8cm

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