A) \[4\pi {{r}^{2}}T\]
B) \[2\pi {{r}^{2}}T\]
C) \[12\pi {{r}^{2}}T\]
D) \[24\pi {{r}^{2}}T\]
Correct Answer: D
Solution :
\[W=8\pi T(R_{2}^{2}-R_{1}^{2})=8\pi T[{{(2r)}^{2}}-{{(r)}^{2}}]=24\pi {{r}^{2}}T\]
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