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Two soap bubbles of radii R₁ < R₂ are connected by a tube. Air flows:
AFrom smaller into the larger
BFrom larger into the smaller
CNeither way — equilibrium
DDepends on temperature
Answer & Solution
Correct answer: A. From smaller into the larger
1. Excess pressure in a soap bubble = 4 T / R.
2. Smaller R ⇒ HIGHER internal pressure.
3. Air flows from HIGH to LOW pressure — i.e., from the smaller bubble into the larger one.
4. The smaller bubble eventually collapses while the larger one grows.
_Source: NCERT Class 11 Physics Ch 9 §9.8 Bubbles_
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