일반물리학 2 — Magnetic Fields Due to Currents: Problem 13

13 In Fig. 29-31, a conductor carries 2.0 A along the closed path $abcdefgha$ running along 8 of the 12 edges of a cube of edge length 10 cm. (a) Taking the path to be a combination of three square current loops ($bcfgb$, $abgha$, and $cdefc$), find the net magnetic moment of the path in unit-vector notation. (b) What is the magnitude of the net magnetic field at the $xyz$ coordinates of (0, 5.0 m, 0)?