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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

A

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

B

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

C

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

D

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

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The correct Answer is:
B
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