Question

a square wire of side L is floating on the surface of liquid of surface tension T. the force required to pull out the frame from the liquid is ​

Answer 1

Answer:

F= 8TL

Explanation:

A square wire of side L and T value liquid surface tension. But

the surface tension of a liquid is defined as the force per unit length in the plane of the liquid surface, acting at right angles on either side of an imaginary line drawn on that surface. Thus,

Since, membrane has two free surfaces, total force acting is given by

F=2×T×F

=2×T× boundary of frame

F=2T×4LF

=2T×4L

F=8TL