試卷名稱:107年 - 107 學士後西醫:物理及化學#75196
年份:107年
科目:物理
54. Three long wires parallel to the x axis carry currents as shown. If I = 20 A, what is the magnitude of the magnetic field at the origin point O? ( magnetic constant μ0 = 4π × 10-7 T·m/A )
(A) 19 μT
(B) 28 μT
(C) 37 μT
(D) 47 μT
(E) 58 μT