The bifilar pancake coil at its resonant frequency

[ramset]

Allen
Please pick one and post it here for replication ?

and what does "too soon" mean ?[your answer for where I could find this scrapyard magnet in Jersey ?

I have plenty of friends who worked on these machines ?

[TinselKoala]

@Citfa,


We know who these five disinformation agents are.

And yet you cannot refute anything that any of these 5 people AND MORE say, and they have proven you wrong time and time again. You have posted more demonstrably false DISinformation here than I can shake a stick at. It's practically a fulltime job keeping up with your false claims, misrepresentations and weaseling.

The Ruhmkopff coil is a Hi-voltage transformer inverter. It generates AC current. The negative portion of the sine wave shows up as a curve beneath the zero line on your scope.

That much at least is correct.  As several people have tried to explain to you, current is a flow of charge. Going one way you can call it "negative" and going the other way you can call it "positive" if you like, even though that is incorrect. Current (conventionally) flows from the more Positive pole of a source to the more Negative pole, always. And of course this is the convention that Ben Franklin left us with before it was understood that the Electron is the carrier of the unit Negative charge and that charge in fact flows from the more Negative pole to the more Positive pole.

In fact, one could claim with some justification that ALL electric current in wires is "negative"... since it is the flow of negative charge.

Both positive and negative current flow in the same direction out the secondary coil electrode.

This is false, because current in this particular AC system reverses direction--- as has been explained to you over and over and as is stated mathematically by Faraday's Law of Induction. Look at the sign of d(B)/dt when the B field rises and then falls! Conventional current always flows from the more positive pole of the source to the more negative pole. In your strawman Ruhmkorff (not Ruhmkopff) coil it is once again easy to prove you wrong with elementary electrical components and measuring instruments.

-E=d(B)dt -- look up the meaning of d(anything)/dt in your favorite calculus textbook, and pay attention to the sign of that differential and how it manifests on a graph of "anything" vs. time.

And you may wish to study this image from the Wiki article on your Ruhmkorff coil. Note the polarities of voltage and directions of current.

https://upload.wikimedia.org/wikipedia/commons/thumb/9/97/Induction_coil_waveforms.svg/200px-Induction_coil_waveforms.svg.png

[TinselKoala]

T. K.                              Battery is source when switch is on - coil becomes the source when switch is off

That is right. Can you explain that to Synchro? Note that in your nice picture the (conventional) current continues to flow in the coil, through it and out of the BOTTOM of the coil when switched off, just as it does when the switch is on. Same direction, no reversal.

This is exactly what I demonstrate in my two videos with their associated schematics.

The schematic below, shown in my coil current direction video (1) was drawn on 30 March.

[synchro1]

@Tinselkoala,


I challenged you to define a "Negative Micro-Henry" not deliver a dissertation on the Ruhmkopf coil.

[TinselKoala]

Allen
Please pick one and post it here for replication ?

and what does "too soon" mean ?[your answer for where I could find this scrapyard magnet in Jersey ?

I have plenty of friends who worked on these machines ?

I've done a little research on scrapyard magnets since we last talked.
Just google "Are scrapyard magnets AC or DC?" without the quotes, and you will find a wealth of information from makers of these magnets.