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Fluid Mechanics: Surface Tension MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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Surface TensionMediumQuestion 30966

Question

Work done in blowing a soap bubble from radius R₁ to R₂ is:
  1. A
    8πT(R₂²−R₁²)
    Correct
  2. B
    4πT(R₂²−R₁²)
  3. C
    T×4π(R₂²−R₁²)
  4. D
    Same as A

Correct answer

8πT(R₂²−R₁²)

Explanation

Soap bubble has 2 surfaces. ΔEnergy = T × Δ(total area) = T × 2 × 4π(R₂² − R₁²) = 8πT(R₂² − R₁²).

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