Modern trains are based on Maglev technology in which trains are magnetically elevated which runs its `EDS` Maglev system.
There are coils on both sides of wheels.Due to motion of train current induces in the coil of track which elevate it.This is in accordance with Lenz's law.If trains lower down then due to Lenz's law a repulsive force increases due to which train gets uplifted and if it goes much high then there is a net downward force due to gravity.
The advantage of 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 maglev train is that as it slows down the electromagnetic forces decreases and it becomes difficult to keep it elevated and as it moves forward according to Lenz law there is an electromagnetic drag force.
What is the disadvantage of this system?

Options

A. Train experiences upward force according to Lenz's law
B. Friction force create a drag on the train
C. Retardation
D. By Lenz's law train experience a drag

Explanation

To analyze the disadvantages of the Maglev train system based on the information provided, we can break down the explanation into clear steps:

### Step-by-Step Solution:

1. **Understanding Maglev Technology**:
- Maglev stands for magnetic levitation, which allows trains to float above the tracks using magnetic forces. This technology eliminates friction between the train and the track.

2. **Induction and Lenz's Law**:
- The operation of Maglev trains involves electromagnetic induction. As the train moves, it induces a current in the coils on the track. According to Lenz's law, this induced current generates a magnetic field that opposes the change causing it, which helps in elevating the train.

3. **Advantages of Maglev Trains**:
- The primary advantage of Maglev trains is the lack of friction, which leads to reduced power consumption and allows for high-speed travel.

4. **Disadvantages of Maglev Trains**:
- As the train slows down, the electromagnetic forces that keep it elevated decrease. This makes it challenging to maintain the elevation, potentially leading to contact between the train and the track, which would increase friction.
- Additionally, as the train moves forward, it experiences electromagnetic drag force due to Lenz's law. This drag force opposes the motion of the train, making it harder for the train to accelerate.

5. **Conclusion on Disadvantages**:
- The two main disadvantages of the Maglev system are:
- Difficulty in maintaining elevation as speed decreases, which can lead to increased friction.
- The presence of electromagnetic drag force that opposes the train's motion.

### Final Answer:
The disadvantages of the Maglev train system include:
- Difficulty in maintaining elevation as the train slows down, leading to potential contact with the track and increased friction.
- The presence of electromagnetic drag force that opposes the motion of the train.