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![The principles underlying radio communication . PlG.^i Fl<^.<i^ =J IHKH^ CircuUr Coil FlQ.Gl ^. ^oleneiei Md^ncTic Field of vSofenoiW closely with many turns, side by side along the surface of acylinder The principles underlying radio communication . PlG.^i Fl<^.<i^ =J IHKH^ CircuUr Coil FlQ.Gl ^. ^oleneiei Md^ncTic Field of vSofenoiW closely with many turns, side by side along the surface of acylinder](https://c8.alamy.com/comp/2CRMRFY/the-principles-underlying-radio-communication-plgi-flltlti-=j-ihkh-circuur-coil-flqgl-oleneiei-mdnctic-field-of-vsofenoiw-closely-with-many-turns-side-by-side-along-the-surface-of-acylinder-in-a-single-layer-the-coil-is-called-a-solenoid-fig62-in-this-case-the-magnetic-field-is-nearly-uniform-for-aconsiderable-distance-near-the-center-of-the-coil-and-thesolenoid-has-the-properties-of-a-bar-magnet-this-is-seen-bycomparing-the-magnetic-fields-of-figs-63-and-59-the-intensityof-the-field-and-the-magnetic-flux-density-within-the-solenoiddepend-entirely-upon-the-strengt-2CRMRFY.jpg)