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

The ring of radius 1 m is lying on the surface of liquid. It is lifted

1.	The ring of radius 1 m is lying on the surface of liquid. It is lifted from the liquid surface by a force of 4 Newton in such a way that the liquid film in it remains intact. The surface tension of liquid will be-
Answer» `(1)/( 2PI ) N//m` `(1)/( PI) N//m` `(1)/( 3PI ) N//m` `(1)/( 4pi) N//m` Answer :B