A) \[30000\pi \,A{{m}^{-1}}\]
B) \[3\pi \,A{{m}^{-1}}\]
C) \[30000\,A{{m}^{-1}}\]
D) \[300\,A{{m}^{-1}}\]
Correct Answer: C
Solution :
[c] M (mag. moment/volume) \[=\frac{NiA}{A\ell }\] \[=\frac{Ni}{\ell }=\frac{(500)15}{25\times {{10}^{-2}}}=30000\,A{{m}^{-1}}\]
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