Ah I see where this is headed now...I think

What's confusing is the ring magnet compared to the horseshoe magnet.
I'd like to see the ring magnet design, because i'll replicate that for sure with the microwave magnets here
The horseshoes fields are free at the two poles on opposite sides of the coil (copper disk), whereas in a ring magnet they are on the top and bottom.
What would be equivalent, would be 2 ring magnets connected on a shaft, either side of the coil. That would simulate the horseshoe. The 2 ring magnets would give a larger surface area to work on a BPC. However, most flux is at the very centre of a BPC.
Hmmm, if both ring magnets were facing with same poles inward they would fight each other. Would a pseudo Bloch Wall be created at the point of the spinning BPC ? That one has me very interested indeed...to use the zeroing energies of that area. It may not be a Bloch Wall of course and I may be talking out of the proverbial posterior

OR, at a very fast RPM. the shaft could be removed from the BPC and it sits there spinning, levitating away and locked by the magnetic anti-gravitic forces! or not.
1. I can see it working with a UPC, if the windings are very tight and very many.
2. Brushes 'should' be needed, but who has tried without and by another means ?
3. Good question, no idea !
4. If Faraday created a voltage, he also collected more than uA one would imagine. A detectable voltage probably copper disk size related.
5.The single winding would be expected to produce a similarity to the copper disk...but is it Eddy forces, or is it an induced voltage by some other means that a coil could collect ?
The BPC may throw up a surprise, the UPC would be the fave though for initial results, if some kind of Eddy current isn't the reason for the produced voltage.