Advanced countries are making use of powerful electromagnets to move trains at very high speed. These trains are called maglev trains (abbreviated from magnetic levitation).These trains float on a guideway and do not run on steel rail tracks.
Instead of using a engine based on fossil fuels, they make use of magnetic field forces. The magnetized coils are arranged in the guide way which repels the strong magnets placed in the train's under carriage. This helps train move over the guideway, a technic called electro - dynamic suspension. When current passes in the coils of guideway , a typical magnetic field is set up between the undercarriage of train and guideway which pushes and pull the train along the guideway depending on the requirement.
The lack of friction and its aerodynamic style allows the train to more at very high speed.
(i) The levitation of the train is due to

Options

A. Mechanical force
B. Electrostatic attraction
C. Electrostatic repulsion
D. Magnetic repulsion

Explanation

The magnetised coils running along the track repel large magnets on the train's under carriage.