\f11. Magnetic levitation (maglev) trains "float" above the rails. A permanent magnet mounted on the train interacts with an electromagnet in the rail. If it is assumed that the permanent magnet in each of the diagrams below is identical and that the current is the same in each electromagnet, then which of the following designs would produce the greatest lift? A. B. S Permanent Permanent magnet on train magnet on train N S Electromagnet Electromagnet in rail in rail C. D. S N Permanent Permanent magnet on train magnet on train N S Electromagnet Electromagnet in rail in rail