MCQ

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The amount of work done in blowing a soap bubble such that its diameter increases from $d$ to $D$ is ( $T$ = surface tension of the solution)

• A
  $4 \pi\left(D^2-d^2\right) T$
• B
  $8 \pi\left(D^2-d^2\right) T$
• C
  $\pi\left(D^2-d^2\right) T$
• ✓
  $2 \pi\left(D^2-d^2\right) T$