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A thin film of liquid is formed in a rectangular frame of wire and a light slider supports a weight of `(2.5 * 10^-2)N`.The length of slider is 20cm and its weight negligible. The surface tension is liquid is

A

`6.25X10^-2 Nm^-1`

B

`12.5X10^-2 Nm^-1`

C

`25X10^-2 Nm^-1`

D

`2.5X10^-2 Nm^-1`

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Knowledge Check

  • A thin liquid film formed between a U-shaped wire and a light slider supports a weight of 1.5xx10^-2N (see figure). The length of the slider is 30cm and its weight negligible. The surface tension of the liquid film is

    A
    (a) `0.0125Nm^-1`
    B
    (b) `0.1Nm^-1`
    C
    (c) `0.05Nm^-1`
    D
    (d) `0.025Nm^-1`

  • A thin liquid film formed between a U- shaped wire and a light slider supports a weight of 1.5 xx 10^(-2)N (see figure). The length of the slider is 30 cm and its weight neligible. The surfaces tension of the liquid film is :

    A
    `0.0125 Nm^(-1)`
    B
    `0.1 Nm^(-1)`
    C
    `0.05 Nm^(-1)`
    D
    `0.025 Nm^(-1)`

  • Choose the most appropriate option. A U-shaped wire is dipped in a soap solution and removed. The thin soap film formed between the wire and light slider supports a weight of 1.5 xx 10^(2) N. The length of the slider is 30 cm. What is the surface tension of the film?

    A
    `3 xx 10^(-3)Nm^(-1)`
    B
    `2 xx 10^(-5)Nm^(-1)`
    C
    `4 xx 10^(-4)Nm^(-1)`
    D
    `2.5 xx 10^(-2)Nm^(-1)`

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