試卷名稱:107年 - 物理及化學#86559
年份:107年
科目:學士後西醫物理及化學
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