A) \[30000\,A{{m}^{-1}}\]
B) \[3\pi \,A{{m}^{-1}}\]
C) \[30000\pi \,A{{m}^{-1}}\]
D) \[300\,A{{m}^{-1}}\]
Correct Answer: A
Solution :
| [a] \[l=20cm\] \[r=2cm\] |
| \[N=500turms\] \[i=15A\] |
| \[\overrightarrow{M}=\frac{500\times 15\times \pi \times {{\left( 2\times {{10}^{-2}} \right)}^{2}}}{\pi {{\left( 2\times {{10}^{-2}} \right)}^{2}}\times 25\times {{10}^{-2}}}\] |
| \[=\frac{15\times 500}{25\times {{10}^{-2}}}\] |
| \[=\frac{7500\times {{10}^{2}}}{25}=30000A{{M}^{-1}}\] |
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