St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 81
s said to be induced, and is an i7iverse one when 77 78 ELECTRICITY GENERATED BY INDUCTION. the magnet is inserted, and a direcl one when the magnetis withdrawn from the coil. lOi. Induced Currents and Lines of Force. Per-manent magnets are constantly sending out thousands oflines of force. Fig.… … force. This produces an indirecft current. If an ironcore be used in the coil, the induced current will begreatly strengthened. It takes force to move a magnet through the center ofa coil, and it is this work that is the source of the inducedcurrent. We have, in this simple experiment, the key…
Electricity
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