問題詳情

54. Three long wires parallel to the x axis carry currents as shown. If I = 20 A, what is the magnitude of the magnetic fieldat the origin point O? ( magnetic constant μ0 = 4π × 10-7T·m/A )


(A) 19 μT
(B) 28 μT
(C) 37 μT
(D) 47 μT
(E) 58 μT

參考答案

答案：A
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)