When the switch closes the electrical circuit open-vibrating. Electric current through the primary winding is rhythmic changes, according to records that will cause a magnetic field that changes within the steel core of the ring because of the large number of coils coil B. Voltage briefly appears at the end of the two coils B, which is a space where the internal electric narrow Strait is enough to make the difference between a weather channel. It is an electric conductor, electric current through the Strait. You will see an electric spark moves through this Strait
. When Hertz used a flat metal plate connected to both ends of the coil secondary G Strait straight and use a wire leading customers as the rest of the circle D channel, and brought around some G Strait. Figure 18.3 electric spark will observe the D channel every time an electric G Strait.
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