A) \[4.8\times {{10}^{-5}}\]
B) \[3.9\times {{10}^{-4}}\]
C) \[2.7\times {{10}^{-5}}\]
D) \[5.2\times {{10}^{-4}}\]
E) None of these
Correct Answer: A
Solution :
The number of turns per unit length of toroid is\[n=\frac{400}{2\pi R}\] The magnetic intensity \[H=ni\] \[=\frac{400\times 2}{2\pi \times \frac{10}{\pi }\times {{10}^{-2}}}=1000\,A{{m}^{-1}}\] The susceptibility is \[\chi =I/H=\frac{4.8\times {{10}^{-2}}A{{m}^{-1}}}{1000\,A{{m}^{-1}}}\] \[=4.8\times {{10}^{-5}}\]
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