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There is a horizontal film of soap solut...

There is a horizontal film of soap solution. On it a thread is placed in the form of a loop. The film is punctured inside the loop and the thread becomes a circular loop of radius `R`. If the surface tension of the soap solution be `T`, then the tension in the thread will be :

A

`piR^(2)//T`

B

`piR^(2)T`

C

`2piRT`

D

`2RT`

Text Solution

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The correct Answer is:
D
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Knowledge Check

  • There is a howizontal film of soap solution. On it a thread is placed in the form of a loop. The film is pierced inside the loop and the thread becomes a circular loop of radius R . If the surface tension of the loop be T , then what will be the tension in the thread?

    A
    `(piR^2)/(T)`
    B
    `piR^2T`
    C
    `2piRT`
    D
    `2RT`

  • When soap solution dissolves in water , then the surface tension of soap solution is

    A
    reduced
    B
    increased
    C
    remains constant
    D
    zero

  • The work done in blowing a soap bubble of 10 cm radius is (Surface tension of the soap solution is 3/100 N/m)

    A
    `75.36xx10^(-4) ` joule
    B
    `37.68xx10^(-4) ` joule
    C
    `150.72xx10^(-4)` joule
    D
    75.36 joule

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    A massless inextensible string in the form of a loop is placed on a horizontal film of soap solution of surface tension T. If film is pierced inside the loop and it convert into a circular loop of diameter d, then the tension produced in string is

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