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Excess pressure inside spherical drop of radius r (surface tension γ):
A4γ/r
Bγr
C2γ/r
Dγ/r
Answer & Solution
Correct answer: C. 2γ/r
For liquid drop: ΔP = 2γ/r (one surface). For soap bubble (two surfaces): ΔP = 4γ/r. Smaller drops → higher internal pressure → fast evaporation/coalescence.
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