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b
The figure shows four circular Amperian loops (a, b, c, d) concentric with a wire whose current is
directed out of the page. The current is uniform across the wire's circular cross section (the shaded
region). Rank the loops according to the magnitude of B. ds around each, greatest first.
Oc>d>a>b
O c-d>a> b
O all equal
Od>c>b> a
4
O c d > b> a

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