일반물리학 2 — Magnetic Fields Due to Currents: Problem 28

28 In Fig. 29-42, two semicircular arcs have radii \(R_2 = 7.80 \text{ cm}\) and \(R_1 = 2.86 \text{ cm}\), carry current \(i = 0.281 \text{ A}\), and have the same center of curvature \(C\). What are the (a) magnitude and (b) direction (into or out of the page) of the net magnetic field at \(C\)?