A) 2\[\pi {{R}^{2}}T\]
B) 3\[\pi {{R}^{2}}T\]
C) 4\[\pi {{R}^{2}}T\]
D) 2\[\pi R{{T}^{2}}\]
Correct Answer: C
Solution :
\[W=4\pi {{R}^{2}}T({{r}^{1/3}}-1)=4\pi {{R}^{2}}T({{8}^{1/3}}-1)=4\pi {{R}^{2}}T\]
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