8 In Fig. 29-40, two semicircular arcs have radii R₂ = 7.80 cm and R₁ = 3.15 cm, carry current i = 0.281 A, and have the same center of cur- vature C. What are the (a) magnitude and (b) direction (into or out of the page) of the net magnetic field at C? R₂ R₁
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