A square wire frame of side / is floating on the surface of liquid of surface tension T. The force required to pull out the frame from the liquid is

A thin wire ring of radius of 2m is placed on the surface a liquid. If a force of 4N is required to pull this ring from the surface of liquid (before the liquid film breaks) then the surface tension of liquid is

A very light, rectangular wire-frame of dimensions 7 cm xx 5 cm hangs just above the free surface of a liquid of surface tension T, with its plane parallel to the free surface. The wire -frame is just brought in contact with the liquid surface and then, lifted up. If the force required to lift the wire-frame is 3.36 N, then what is the value of T in (N m^(-1)) ?

A very light, rectangular wire-frame of dimensions 7 cm xx 5 cm hangs just above the free surface of a liquid of surface tension T, with its plane parallel to the free surface. The wire -frame is just brought in contact with the liquid surface and then, lifted up. If the force required to lift the wire-frame is 3.36 N, then what is the value of T in (N m^(-1)) ?

A metal ring of internal and external radii 15 mm and 20 mm respectively is placed horizontally on the surface of a liquid of surface tension 0.03 N/m To detach the ring from the liquid surface the force required is