What's the speed? Is it dangerous to do such experiments? The longer the brass tubes, the more obvious the effect is
This metal tube in the magnetic field of the magnet motion hinder, make the speed of the whereabouts of the magnet can not always increase, the faster the whereabouts of the magnet, its effects on the metal tube (resistance) is bigger, finally when the resistance metal tube in the magnetic field of the magnet is equal to the gravity magnet, magnet can't after the acceleration, uniform motion in a straight line in the metal pipe.This permanent magnet does no harm to the human body. This experiment will not do any harm to human bodyIt is only when the copper tube is relatively long that a uniform motion can occur. The longer it is, the more obvious it is
In the process of the whereabouts of the magnet, the magnetic flux cross section magnet is arranged below the metal tube to increase the flux of metal pipe section above the magnet in the magnetic flux will decrease under the cross section as long as the change induced current induced current magnetic field, the total change of the magnetic field of permanent magnet block and that will hinder the movement of the magnet. The judgment of Lenz's law is: "to deny the fate.
There is a magnetic field around the permanent magnet. When it is placed in the metal tube, the magnetic field of the magnet passes through some cross section of the metal tube, causing magnetic flux in some cross sections of the metal tube
