A) \[24\pi {{R}^{2}}T\]
B) \[12T\pi {{r}^{2}}\]
C) \[6T\pi {{r}^{2}}\]
D) \[4T\pi {{r}^{2}}\]
Correct Answer: B
Solution :
\[W=T.\Delta A\] \[=T.[4\pi (2{{n}^{2}}-4\pi {{r}^{2}})]\] \[=12T\pi {{r}^{2}}\]
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