A) 30 erg
B) 11.35 erg
C) 2261 erg
D) 96 erg
Correct Answer: C
Solution :
\[W=2T\times 4\pi \,\,\left[ {{(2r)}^{2}}-{{r}^{2}} \right]=24\,\times T\times \pi {{r}^{2}}\] \[=24\,\times 30\,\times 3.14\,\times {{1}^{2}}\,=2260.8\,erg\] Ans.
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