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Question

The material of a wire has a density of 1.4 g/cm3. If it is not wetted by a liquid of surface tension 44 dyne/cm, then the maximum radius of the wire which can float on the surface of liquid is :

A
1028cm
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B
1014cm
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C
107mm
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D
0.7 cm
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Solution

The correct option is C 107mm
2Tl=πr2Id×g
r=(2Tπdg)=2×44×722×1.4×980
=17cm=107mm

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