A light open rigid wire frame floats on the surface of water as shown in a figure. What force will act on the frame, immediately after some soap solution is dropped inside it? α1 and α2 are the surface tensions of water and soap respectively (α1 > α2 ). a. Image
Options

Question

A light open rigid wire frame floats on the surface of water as shown in a figure. What force will act on the frame, immediately after some soap solution is dropped inside it? α1 and α2 are the surface tensions of water and soap respectively (α1 > α2 ). a. Image

Options

G1 Physics · Accepted Answer

Step 1: Use surface-energy/pressure relations: ΔP = 2T/R for a liquid drop or 4T/R for a soap bubble, capillary rise h = 2T cosθ/(ρgr), and surface energy = TΔA. Step 2: Apply force or energy balance to the stated radii and surface areas. Applying these relations to the given data gives B: (α1 − α2 )ℓ b. Final answer: B.