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Current through coils
K7ITM wrote:
"Cyclical variation in charge (contained within a volume)" means that on average the charge stays constant, but it does not mean that it's constant over some arbitratily short but finite length of time. The current reported by EZNEC is RMS current, Tom. What happens within a cycle is irrelevant to this discussion. We are not and never have been discussing variations within a cycle. There's just no point. We have been discussing RMS values of currents. Your attempt to again divert the issue is noted. We are talking about net charge spread out over many steady-state cycles. That net charge is always zero no matter what the RMS value of the standing wave current at the ends of the coil. Without the capacitance, without the ability to store charge, a transmission line, an antenna wire, a loading coil, all of them--would not have the ability to cause delay. Freespace, without a non-zero permittivity (capacitance), would allow infinite speed of light. But all these things DO have capacitance, and they DO have speed-of-propagation at the speed of light or slower. Please tell us something we don't already know. It has become apparent that the discussion is not about coils at all. It is about the nature of standing waves whether existing in a transmission line, a standing wave antenna wire, or a coil. -- 73, Cecil http://www.qsl.net/w5dxp |
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