Magnet fall inside a conductive pipe（磁铁在导电管）.pdf

Home Search Collections Journals About Contact us My IOPscience Magnet fall inside a conductive pipe: motion and the role of the pipe wall thickness This article has been downloaded from IOPscience. Please scroll down to see the full text article. 2009 Eur. J. Phys. 30 855 (/0143-0807/30/4/018) View the table of contents for this issue, or go to the journal homepage for more Download details: IP Address: 25 The article was downloaded on 05/02/2013 at 07:55 Please note that terms and conditions apply. IOP PUBLISHING EUROPEAN JOURNAL OF PHYSICS Eur. J. Phys. 30 (2009) 855–869 doi:10.1088/0143-0807/30/4/018 Magnet fall inside a conductive pipe: motion and the role of the pipe wall thickness G Donoso, C L Ladera and P Mart´ın ´ ´ ´ Departamento de Fısica, Universidad Simon Bolıvar, Apdo. 89000, Caracas 1080, Venezuela E-mail: clladera@usb.ve and pmartin@usb.ve Received 12 February 2009, in final form 25 March 2009 Published 27 May 2009 Online at /EJP/30/855 Abstract Theoretical models and experimental results are presented for the retarded fall of a strong magnet inside a vertical conductive non-magnetic tube. Predictions and experimental results are in good agreement modelling the magnet as a simple magnetic dipole. The effect of varying the pipe wall thickness on the retarding magnetic drag is studied for pipes of different materials. Conductive pipes of thinner walls produce less dragging force and the retarded