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The figure shows three wires with equal currents
and four Amperian loops (dashed closed paths).
Rank the loops in increasing magnitude
(absolute value) of OB•di .
A. 3<1=4<2
B. 1<2=3<4
C. 3<2<1=4
D. 4<1<2< 3
E. 4<2= 3<1

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