A) \[{{10}^{4}}{{\mu }_{o}}\] metre
B) \[\frac{{{10}^{4}}}{{{\mu }_{o}}}\] metre
C) \[{{10}^{6}}{{\mu }_{o}}\] metre
D) \[\frac{{{10}^{6}}}{{{\mu }_{o}}}\]metre
Correct Answer: A
Solution :
\[B=\frac{{{\mu }_{0}}}{2\pi }\frac{i}{r}\Rightarrow 5\times {{10}^{-5}}=\frac{{{\mu }_{0}}}{2\pi }\times \frac{\pi }{r}\Rightarrow r={{10}^{4}}{{\mu }_{0}}\ metre\]
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