A) 2\[\pi {{D}^{2}}T\]
B) 4\[\pi {{D}^{2}}T\]
C) 6\[\pi {{D}^{2}}T\]
D) 8\[\pi {{D}^{2}}T\]
Correct Answer: C
Solution :
Work done to increase the diameter of bubble from d to D \[W=2\pi ({{D}^{2}}-{{d}^{2}})T=2\pi [{{(2D)}^{2}}-{{(D)}^{2}}]\ T=6\pi {{D}^{2}}T\]
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