As the magnet M approaches coil C, magnetic flux linked with the coil increases. `emf//current` is induced in the coil, which opposes the increase in flux. When magnet in inside the coil, magnetic flux linked with the coil is constant. Induced `emf//current` is zero. As the magnet falls below the coil, mag. flux linked with the coil decreases. `emf//current` is induced in the coil, which opposes the decrease in flux. As velocity of magent has increased, induced `emf//current` is more. Therefore, nagative peak is longer than the positive peak. When the magnet has fallen through large distance, changing mag. flux due to its movement vanishes. Induced emf reduces to zero.
