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CHAPTER XXII MAGNETIC GENERATION OF ELECTRIC CURRENT
(1) Imagine a steel magnet lying on a table near a piece of copper wire. Copper wire is a conductor, therefore it contains either "free" negatrons, or negatrons easily detached from their atoms. If either the magnet or the wire be moved, the influence of the magnetic field upon the negatrons within the copper will cause those negatrons to move into new positions. While they are doing this they of course constitute an electric current, since for that brief period of time they are negatrons in motion.
If the motion of either the magnet or the conductor can be made continuous, the motion of the negatrons within the conductor will also be continuous, and a steady current will flow.
The Electric Generator
In another part of this book (see Page 295) there will be found a description of the mechanism of a generator, which is one device by means of which current flow is created through motion of conductors in a magnetic field.
(2) As a matter of practical fact, continuous or direct current cannot be generated by motion in a magnetic field. If the motion were to continue in the same direction for any appreciable length of time the conductor and the magnet would soon be so far apart that the magnetic influence could not operate. Therefore a motion that causes the conductor to cut through lines of force in the magnetic field without taking the conductor out of the field must be arranged, which is done by making the conductor alternately approach and recede from the magnet, and the current generated by magnetic
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