A) \[2\pi \,\,c{{m}^{2}}\]
B) \[3\pi \,\,c{{m}^{2}}\]
C) \[4\pi \,\,c{{m}^{2}}\]
D) \[\pi \,\,c{{m}^{2}}\]
E) None of these
Correct Answer: A
Solution :
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