The ring of radius 1 m is lying on the s...

The ring of radius 1 m is lying on the surface of liquid. It is lifted. It is lifted from the liquid surface by a force of 4 newtons in such a way that the liquid film in it remains intact. The surface tension of liquid will be

`(1)/(2pi)N//m`

`(1)/(pi)N//m`

`(1)/(3pi)N//m`

`(1)/(4pi)N//m`

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ALLEN -ELASTICITY, SURFACE TENSION AND FLUID MECHANICS-Exercise 1 (Surface Tension)

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