When a loop of wire is dipped in a wetting liquid and is taken out. A liquid film is formed and a loop of light inextensible thread is gently put on the liquid film. A hole is pricked inside the loop of thread. Due to property of surface tension, free surface of the liquid tries to minimize its surface area and hence area of the hole will be maximized. In the above description, loop wire is square of side units. If length of thread is units, what is the final surface area for soap film on one side of wire frame? (Neglect the friction everywhere)
Important Questions on Surface Tension
When a loop of wire is dipped in a wetting liquid and is taken out. A liquid film is formed and a loop of light inextensible thread is gently put on the liquid film. A hole is pricked inside the loop of thread. Due to property of surface tension, free surface of the liquid tries to minimize its surface area and hence area of the hole will be maximized. In the above description, loop wire is square of side 4 units, liquid is soap and length of loop of thread is 15 units. If the surface tension of soap is 'S', what is the tension in the thread?
