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There is a howizontal film of soap solut...

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

`pi R^(2) //T`

B

`pi R^(2) T`

C

`2piRT`

D

`2RT`

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Knowledge Check

  • 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`

  • Considering magnetic field along the axis of a circular loop of radius R , at what distance from the centre of the loop is the field one eighth of its value at the centre ?

    A
    `4R`
    B
    `sqrt(3) R`
    C
    `3R`
    D
    `6R`

  • What will be magnetic field at centre of current carrying circular loop of radius R?

    A
    `(mu_(0)I)/(4piR)`
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