Question

Modern trains are based on Maglev technology in which trains are magnetically levitated, which runs its EDS Maglev system.There are coils on both sides of the wheels. Due to motion of the train, current induces in the coil of track which levitates it. This is in accordance with Lenz's law. If a train lowers down then due to Lenz's law, repulsive force increases due to which the train gets uplifted and if it goes much higher then there is a net downward force due to gravity. The advantage of the Maglev train is that there is no friction between the train and the track, thereby reducing power consumption and enabling the train to attain very high speeds.Disadvantage of the Maglev train is that as it slows down, the electromagnetic force decreases and it becomes difficult to keep it levitated and as it moves forward according to Lenz's law there is an electromagnetic drag force.

What force causes the train to elevate?
A. Electrostatic force
B. Time varying electric field
C. Magnetic force
D. Induced electric field

Answer 1

Hint:As we have to discuss the type of force which helps the train to elevate up, so the train's velocity creates current in the track coil, which levitates it. According to Lenz's law, this is the case. If the train descends, the repulsive force increases, causing the train to rise, and if it rises much higher, there is a net downward force owing to gravity.

Complete step by step answer:
Magnetic force produced by current in a moving coil causes the train to elevate.The train's velocity creates current in the track coil, which levitates it. According to Lenz's law, this is the case. If the train descends, the repulsive force increases, causing the train to rise, and if it rises much higher, there is a net downward force owing to gravity. Magnetic levitation (maglev) or magnetic suspension is a way of suspending an item using just magnetic fields as a support. The magnetic force is utilised to offset the gravitational and other forces' effects.

Lifting forces ensuring that the system does not spontaneously slide or flip into a configuration where the lift is neutralised; and stability: ensuring that the system does not spontaneously slide or flip into a configuration where the lift is neutralised.Maglev trains, contactless melting, magnetic bearings, and product display all use magnetic levitation.

Magnetic materials and systems can attract or press each other apart or together with a force that is proportional to the magnetic field and the magnets' area. For example, a basic dipole magnet positioned in the magnetic fields of another dipole magnet, orientated with like poles facing each other, repels the two magnets due to the force between them.

Hence, the correct option is C.

Note: Magnetic Levitation, or Maglev, is a mode of transportation in which trains float on a guideway due to magnetic repulsion. There are two poles on each magnet. Now, if we use two magnets, we can see that opposite poles attract, whereas comparable poles repel.