A rectagular wire frame with one movable side is convered by a soap film (fig.). What force should
Channel: Doubtnut
Date: 2020-04-12

A rectagular wire frame with one movable side is convered by a soap film (fig.). What force should be applied to the movable side to counterbalance it ? What work will be done if this side of the frame is moved a distance `S = 2 cm` ? The length of the movable side is `l = 6cm`. The surface tension of the soap film is `alpha = 40 "dyne"//cm`.