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When a 'U' shaped slider of negligible mass is dipped in a soa

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When a 'U' shaped slider of negligible mass is dipped in a soap solution and lifted, a thin film of soap is formed in the frame. It supports a weight of 2.0 x 10 $^{- 2}$ N. If the length of the slider is 40cm, the surface tension of the film of soap is:

25 Nm

^{- 1}

2.5 Nm

^{- 1}

2.5 x 10

^{- 2}

^{- 1}

2.5 x 10

^{- 3}

^{- 1}

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When a 'U' shaped slider of negligible mass is dipped in a soap solution and lifted, a thin film of soap is formed in the frame. It supports a weight of 2.0 x 10

^{- 2}

N. If the length of the slider is 40cm, the surface tension of the film of soap is:

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Text solutionVerified

Given:
Length of the slider

= 40

Weight supports

= 2.0 \times 1 0^{- 2}

The surface tension here is given as

σ = \frac{F}{2 l} = \frac{2 \times 1 0 ^{- 2}}{2 \times 0.4} = 2.5 \times 1 0^{- 2} N m^{- 1}

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Question Text	When a 'U' shaped slider of negligible mass is dipped in a soap solution and lifted, a thin film of soap is formed in the frame. It supports a weight of 2.0 x 10 $^{- 2}$ N. If the length of the slider is 40cm, the surface tension of the film of soap is:
Answer Type	Text solution:1
Upvotes	150

When a 'U' shaped slider of negligible mass is dipped in a soap solution and lifted, a thin film of soap is formed in the frame. It supports a weight of 2.0 x 10−2 N. If the length of the slider is 40cm, the surface tension of the film of soap is:

Text solutionVerified

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When a 'U' shaped slider of negligible mass is dipped in a soap solution and lifted, a thin film of soap is formed in the frame. It supports a weight of 2.0 x 10 $^{- 2}$ N. If the length of the slider is 40cm, the surface tension of the film of soap is: