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Surface tension

A thin wire ring of 3 cm radius float on the surface of a liqu

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Solving time: 3 mins

A thin wire ring of $3 c m$ radius float on the surface of a liquid. The pull required to raise the ring before the film breaks is $30.14 \times 1 0^{- 3} N$ more than its weight. The surface tension of the liquid (in $N m^{- 1}$ ) is:

80 \times 1 0^{- 3}

87 \times 1 0^{- 3}

90 \times 1 0^{- 3}

98 \times 1 0^{- 3}

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Scarlett Discussed

A thin wire ring of

3 c m

radius float on the surface of a liquid. The pull required to raise the ring before the film breaks is

30.14 \times 1 0^{- 3} N

more than its weight. The surface tension of the liquid (in

N m^{- 1}

) is:

8 mins ago

Discuss this question LIVE

8 mins ago

Text solutionVerified

Extra pull to overcame surface tension is

30.14 \times 1 0^{3} N

⟹ 30.14 \times 1 0^{- 3} = 2 \times 2 π \times (0.03) \times T

⟹ 79.9 \times 1 0^{- 3} N / m = T

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Question Text	A thin wire ring of $3 c m$ radius float on the surface of a liquid. The pull required to raise the ring before the film breaks is $30.14 \times 1 0^{- 3} N$ more than its weight. The surface tension of the liquid (in $N m^{- 1}$ ) is:
Topic	Mechanical Properties of Fluids
Subject	Physics
Class	Class 11
Answer Type	Text solution:1
Upvotes	125

A thin wire ring of $3 c m$ radius float on the surface of a liquid. The pull required to raise the ring before the film breaks is $30.14 \times 1 0^{- 3} N$ more than its weight. The surface tension of the liquid (in $N m^{- 1}$ ) is:

Text solutionVerified

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A thin wire ring of $3 c m$ radius float on the surface of a liquid. The pull required to raise the ring before the film breaks is $30.14 \times 1 0^{- 3} N$ more than its weight. The surface tension of the liquid (in $N m^{- 1}$ ) is: