A) 180 ergs
B) 360 ergs
C) 720 ergs
D) 960 ergs
Correct Answer: C
Solution :
\[W=8\pi T(r_{2}^{2}-r_{1}^{2})\]\[=8\pi T\left[ {{\left( \frac{2}{\sqrt{\pi }} \right)}^{2}}-{{\left( \frac{1}{\sqrt{\pi }} \right)}^{2}} \right]\] W = \[8\times \pi \times 30\times \frac{3}{\pi }\]\[=720\ erg\]
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