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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