일반물리학 2 — Magnetic Fields Due to Currents: Problem 52

52 In Fig. 29-57, a wire forms a semicircle of radius \( R = 9.26 \text{ cm} \) and two (radial) straight segments each of length \( L = 13.1 \text{ cm} \). The wire carries current \( i = 32.3 \text{ mA} \). What are the (a) magnitude and (b) direction (into or out of the page) of the net magnetic field at the semicircle’s center of curvature \( C \)?