Faraday paradox revisited,magnetic field rotation question.

[allcanadian]

@Polac

how did you levitate it? levitron stuff?

I built my own hall effect levitation circuits to experiment with levitation which eventually led to my inventing several 99% passive magnetic bearings. Everyone seems to have a really hard time wrapping their mind around these concepts and I could flick the magnet shown in the levitator I posted and the magnet would spin for hours, not minutes but five to six hours easy. I levitated a 40 pound rotor on my magnetic bearings and could give it a spin with my hand and hours later it was still rotating. People think they understand but they don't because you have to see it to believe it.


I have also built many of my own electronic electrometers and EM detector arrays many years ago which is how I know you do not have a hope in hell of measuring anything spinning a magnet on a string or a chair. Anyone who has built the Faraday Generator and any variations of it and actually tested it would know it requires a substantial RPM to generate even a very small voltage. Anyone who has actually built an electrometer would know there is zero chance of measuring a voltage that small from a distance.


No offence but I'm starting to think nobody here has built or tested anything otherwise they would know these things. I'm starting to wonder if anyone here has proof to justify any of their claims and that this is all unsubstantiated speculation at best.




AC

[PolaczekCebulaczek]

yeah but faraday measured magnets e field with primitive electroscope?

my plan is to rotate magnet on electric drill

[lumen]

Well there you go PolaczekCebulaczek , you don't need to spin it at all.
You can just ask AC what the results will be and he can just set you straight!

[allcanadian]

@Polac

yeah but faraday measured magnets e field with primitive electroscope?[/size]my plan is to rotate magnet on electric drill

I believe Faraday used a galvanometer or as we call it an ammeter to measure the small currents from the generator brushes.  A drill should work as they run from 2500-3000 rpm however a string is pretty much useless. Larger diameter magnets work better because the perimeter velocity increases with diameter at ant given RPM.


The electronic electrometer works good for high voltage and it can detect a person combing their hair 30 feet away. However it is almost impossible to detect smaller voltages, say under 12v, at any distance unless physical contact is made. I have built foil type electrometers and the electronic version is thousands of times more sensitive than a foil type electrometer. You can use op-amps to amplify the signal from an electronic detector however then interference from let's say your drill becomes a big issue. It will also detect contact electrification between materials so we need to ask, is it an induced emf or is it intermittent brush contact or something else.


Reality is not the same as speculation as I imagine you already know and even seemingly simple experiments have a way of becoming very difficult in a big hurry.


AC

[Low-Q]

hello

I decided to start this topic because I want to summarize all we know about Faraday disk paradox in one topic on this forum, this may be helpful for further homopolar generator study.The most important question is "Does magnetic field rotate with magnet or not?"
let's consider a situation like this :

A coil is wrapped around a magnetized core (cylinder magnet). Both the coil and magnet are rotating together around the axis of the cylinder. Will current be induced in the coil?
This permanent magnet is ceramic, not iron; this should stop any induction taking place inside the metal body of the magnet.(if magnetic field does not rotate) This will simplify things and eliminate unwanted effects.

anyone tried this configuration?

If both the winding and the magnet is spinning at the same RPM, nothing will happen. If only the magnet is spinning there will still not be any induction in the coil.
The reason is this: The magnetic field is not changing in strength as it cross the coil even if the magnet is spinning or not, but is the same all the time. If you put that magnet inside a narrow copper tube, and drop it, the magnet will induce currents in the copper that will force the magnet to slow down. However, if you make an initial spin to the magnet, it will spin freely inside the copper tube, with only air as the resistance.


Magnetic fields must cross the wire in only one direction, like it is done in generators. And the magnetic field density has to change in order to induce anything through a wire. So if you push the magnet up and down through the coil, the coil experience a change in magnetic field density, and therfor it is the only way to induce anything through the coil.


Vidar