試題詳解

80. A long straight wire is in the plane of a rectangular conducting loop of wire. The straight wire carries a constant current I as shown in the figure below and is moved towards the rectangular loop. While the wire is being moved towards the rectangular loop, the current in the loop ___________.
(A) is always zero.
(B) flows clockwise around the loop.
(C) flows counterclockwise around the loop.
(D) alternates, first one way then the opposite way around the loop. 11