A) \[\left( \frac{{{\mu }_{0}}i}{\pi {{R}^{2}}} \right).r\]
B) \[\left( \frac{2{{\mu }_{0}}i}{\pi {{R}^{2}}} \right).r\]
C) \[\left( \frac{{{\mu }_{0}}i}{2\pi {{R}^{2}}} \right).r\]
D) \[\left( \frac{{{\mu }_{0}}i}{2\pi R} \right).r\]
Correct Answer: C
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