試題詳解

40. A bar magnet is dropped from above and falls through the loop of wire shown below. The north pole of the bar magnet points downward towards the page as it falls. Which statement is correct?

 
(A) The current in the loop always flows in a clockwise direction.
(B) The current in the loop always flows in a counterclockwise direction.
(C) The current in the loop flows first in a clockwise, then in a counterclockwise. direction.
(D) The current in the loop flows first in a counterclock wise, then in a clockwise. direction.
(E) No current flows in the loop because both ends of the magnet move through the. loop