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 C107mm 2Tl=πr2Id×g r=√(2Tπdg)=√2×44×722×1.4×980 =17cm=107mm