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While a small neodymium magnet is falling through a coil connected into an electric circuit, the induced current is recorded by a computer interface device, MBL. We have measured the current characteristics depending on lengths of coil, 3.6cm, 8.0cm, 16cm, and 30cm with the same number of 400 turns with or without a battery. When the magnet falls vertically toward a coil, the magnet is not free falling because the induced current makes magnetic field. Inside the long coil, the magnet is almost free falling because of no induced current, which ends up with an asymmetric shape. Induced electric current in the circuit that an external battery is supplied is less sensitive. This is because of inertia and magnetic field by the dc current. We found the very interesting point that the maximum of   happens inside coil not inlet plane of the coil.  ,  (2009)             ,  58 : 130-137. , , , , ,  (2004)    . () . Carpena P (1997) Velocity measurements through magnetic induction. Am. J. Phys. 65: 135‐140. Halliday D (2007) Fundamentals of Physics. John Wiley & Sons Inc. Kingman R, Rowland SC and Popescu S (2002) An experimental observation of Faraday’s law of induction. Am. J. Phys. 70 (6): 595‐598. Nicklin R C (1986) Faraday's law ‐ Quantitative experiments. Am. J. Phys. 54: 422‐428. Pelesko JA, Cesky M and Huertas S (2005) Lenz’s law and dimensional analysis. Am. J. Phys. 73 (1): 37‐39 Planinic M (2006) Assesment of difficulties of some conceptual areas from electricity and magnetism using the Conceptual Survey of Electricity and Magnetism. Am. J. Phys. 74 (12):1143‐1148. Roy MK, Harbola MK and Verma HC (2007) Demonstration of Lenz`s law: Analysis of a magnet falling through a conducting tube. Am. J. Phys. 75 (8): 728–730. Serway RA, Jeweett JW (2008) Physics for Scientists and Engineers with Modern Physics. Cengage Learning Wood LT, Rottmann RM and Barrera R (2004) Faraday's law, Lenz's law, and conservation of energy. Am. J. Phys. 72: 376‐380.

Analysis of a magnet falling through a coil connected into a RL circuit