A) \[\frac{{{\mu }_{0}}i}{2R}\]
B) \[\frac{{{\mu }_{0}}i}{8R}\]
C) \[\frac{{{\mu }_{0}}i}{4R}\]
D) \[\frac{2{{\mu }_{0}}i}{5R}\]
Correct Answer: B
Solution :
\[B=\frac{{{\mu }_{0}}}{4\pi }\frac{\theta i}{r}=\frac{{{\mu }_{0}}}{4\pi }\times \frac{\pi }{2}\times \frac{i}{R}=\frac{{{\mu }_{0}}i}{8R}\]
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