A) \[{{\mu }_{0}}i/r\]
B) \[4{{\mu }_{0}}i/r\]
C) zero
D) \[{{\mu }_{0}}i/4r\]
Correct Answer: C
Solution :
(c) zero \[B=\frac{{{\mu }_{0}}}{2\pi }\cdot \frac{i}{r}-\frac{{{\mu }_{0}}}{2\pi }\cdot \frac{i}{r}=0\]
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