Question

jolie builds a model of a maglev train. she uses disc magnets to levitate the train. a disc magnet has its north and south poles on its faces, as shown. what is the best way to arrange the magnets on the train and on the track so that the model train levitates? flat, so that the north pole of each magnet on the train points up and the north pole of each magnet on the track points up flat, so that the north pole of the magnets on the train point up and the north poles of the magnets on the track point down on edge, so that the north poles of the magnets on the train point to the front and the north poles of the magnets on the track point toward the rear on edge, so that the north pole of each magnet on the train and on the track point toward the rear of the train

Explanation:

To make the maglev train levitate, the magnets on the train and track must repel each other (since like poles repel). For disc magnets with poles on their faces, arranging them flat: if the north pole of train magnets points up, the track magnets’ north poles should point down (so like poles face each other, causing repulsion). Other options either have like poles attracting (first option) or arrange magnets on edge (which would use attraction or not target vertical levitation, as edge - facing poles would act horizontally).

Answer:

B. flat, so that the north pole of the magnets on the train point up and the north poles of the magnets on the track point down