試題詳解

59. A man wants to know the magnitude of the magnetic field generated by an overhead power line. He estimates that a transmission line is about 10 meters above the ground. The local power company tells him that the line operates at 1 5 kV and provides a maximum of 65 MW to the area. Which of the following values is closest to the peak current (A）?
(A)500
(B)400
(C)200
(D)50
(E)15