6. (a) Recalling the straight sectionsdiscussion in Sample Problem 29-1, we see that the current in segments AHand JDdo not contribute to the field at point C. Using Eq. 29-9 (with φ= π) and the right-hand rule, we find that the current in the semicircular arc H Jcontributes µ014iR(into the page) to the field at C
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