I need some help to calculate the retardation of a magnet cylinder passing trough a coil with an open end which lies horizontal. If you have a 0.5 m long circular coil which is 50 mm in diameter and a circular magnet cylinder fitting in to the rod. The magnet cylinder has an initial speed of 10 m/s when it enters the coil. What speed will the magnet have when it has passed trough inside the coil? And how much will the voltage be between the two open ends of the coil? The number of turns in the coil is 2000 and the weight of the magnet is 0.5 kg and magnetic force is 2 T. I have seen an example where Newton’s second law is set to equal to Lenz’s law in order to calculate the retardation of a metal bar in a magnetic field. But how should I do to take the length and the number of turns of the coil into consideration? Any help would be appreciated.