A) \[24\,\pi {{R}^{2}}S\]
B) \[48\,\pi {{R}^{2}}S\]
C) \[12\,\pi {{R}^{2}}S\]
D) \[36\,\pi {{R}^{2}}S\]
Correct Answer: A
Solution :
\[W=8\pi S(R_{2}^{2}-R_{1}^{2})=8\pi S[{{(2R)}^{2}}-{{R}^{2}}]=24\,\pi {{R}^{2}}S\]
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