A) \[\pi {{r}^{2}}\sigma \]
B) \[2\pi {{r}^{2}}\sigma \]
C) \[4\pi {{r}^{2}}\sigma \]
D) \[8\pi {{r}^{2}}\sigma \]
Correct Answer: D
Solution :
Work done in blowing a soap bubble\[W=\sigma \times 8\pi {{r}^{2}}\]as bubble has two free surfaces.
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