A) \[\frac{{{\mu }_{0}}i}{r}\]
B) \[\frac{{{\mu }_{0}}i}{2r}\]
C) \[\frac{{{\mu }_{0}}i}{4r}\]
D) Zero
Correct Answer: C
Solution :
The induction due to \[AB\] and \[CD\]will be zero. Hence the whole induction will be due to the semicircular part\[BC\]. \[B=\frac{{{\mu }_{o}}i}{4r}\]
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