A thin wire ring of 3cm radius float on the surface of a liquid. The pull required to raise the ring before the film breaks is 30.14×10−3N more than its weight. The surface tension of the liquid (in Nm−1) is:
A
80×10−3
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B
87×10−3
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C
90×10−3
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D
98×10−3
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Solution
The correct option is A80×10−3 Extra pull to overcame surface tension is 30.14×10−3N ⟹30.14×10−3=2×2π×(0.03)×T