In Jolie's model of a maglev train, how should the magnets be arranged for levitation?

• A. 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
• B. flat, so that the north pole of the magnets on the train points up and the north poles of the magnets on the track point down
• C. 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
• D. on edge, so that the north pole of each magnet on the train and on the track point toward the rear of the train

Answer: (B)

For levitation in Jolie's model of a maglev train, the correct arrangement of the magnets is where the north pole of the magnets on the train points up and the north poles of the magnets on the track point down. This configuration is crucial because like poles repel each other. When the north pole of the magnets on the train is facing upward and the north poles of the magnets on the track are facing downward, this arrangement creates a repulsive force between the two sets of magnets. This repulsion allows the train to be lifted off the track, achieving levitation.

The levitation mechanism is central to the functionality of a maglev train, as it minimizes friction and allows for smooth and efficient travel at high speeds. By maximizing this repulsive force, the train can glide above the tracks without physical contact, which is a significant advantage of magnetic levitation technology.