15. A square frame of side L is dipped in a liquid. On taking out, a membrane is formed. If the surface tension of the liquid is T, the force acting on the frame will be (a) 2 TL (b) 4 TL (c) 8 TL (d) 10 TL Ans. (c) Force on each side =2TL (due to two surfaces) Force on the frame = 4(2TL)=8TL (8) Read More
