A) \[36.5\text{ }A{{m}^{2}}\]
B) \[56.5\text{ }A{{m}^{2}}\]
C) \[66.5\text{ }A{{m}^{2}}\]
D) \[108\text{ }A{{m}^{2}}\]
Correct Answer: B
Solution :
(b) \[56.5\text{ }A{{m}^{2}}\] The magnetic moment is given by \[|\overrightarrow{M}|=NlA=Nl\pi {{r}^{2}}=200\times 4\times 3.14\times {{(15\times {{10}^{-2}})}^{2}}\] \[=200\times 4\times 3.14\times 15\times 15\times {{10}^{-4}}=56.5\text{ }A{{m}^{2}}.\]
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