A soap bubble is being blown on a tube of radius 1 cm. The surface tension of the soap solution is 0.05 N m⁻¹ and the bubble makes an angle of 60° with the tube as shown. The excess of pressure over the atmospheric pressure in the tube is : 60° 60°. Image
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Question

A soap bubble is being blown on a tube of radius 1 cm. The surface tension of the soap solution is 0.05 N m⁻¹ and the bubble makes an angle of 60° with the tube as shown. The excess of pressure over the atmospheric pressure in the tube is : 60° 60°. Image

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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 C: 10 Pa. Final answer: C.