A) \[\frac{1}{4\pi }\,{{\mu }_{0}}Wb\]
B) \[\frac{1}{2\pi }\] m0Wb
C) \[\frac{1}{3\pi }{{\mu }_{0}}Wb\]
D) \[0.4\,{{\mu }_{0}}Wb\]
Correct Answer: A
Solution :
\[N\varphi =Li\Rightarrow \varphi =\frac{Li}{N}=\frac{8\times {{10}^{-3}}\times 5\times {{10}^{-3}}}{400}={{10}^{-7}}=\frac{{{\mu }_{0}}}{4\pi }wb\]
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