Assume a coil of a single wire thickness wrapped concentrically around and at right angles to a circular channel through which passes a cylindrical neodymium magnet.
At what point does the number of coils cease to contribute to the overall EMF generated by the magnet travelling through it? I'm aware of the inverse square root law, but have seen extreme examples of great numbers of windings extending far beyond the center of the magnetic source.
The coil is thin in this case to generate the maximum Delta in the passing magnetic field.
TIA,as always!

 

"Assume a coil of a single wire thickness wrapped concentrically around and at right angles to a circular channel through which passes a cylindrical neodymium magnet."

Do you have a picture?

Not sure I understand the setup. Normally I would say at the point of saturation. Is there a core?

 

"Assume a coil of a single wire thickness wrapped concentrically around and at right angles to a circular channel through which passes a cylindrical neodymium magnet."

Do you have a picture?

Not sure I understand the setup. Normally I would say at the point of saturation. Is there a core?

There is a core momentarily as the neodymium cylindrical magnet passes through the air gap in the center of the coil.

Think of it as similar to pushing a pencil eraser through the the punched-out center of a compact disk. The disk represents the very flat coil.
As we know, the passage of the magnet will generate an electromotive flux through the coil. Same principle solenoid, electric generator, etc.
So it seems to me the magnetic field of the magnet reached out a relatively short distance, as per the inverse square law.
However, I've also noted some electrical generators and alternators have really extensive windings.
So the question is: at what is the distance at which windings no longer play any significant role in emf generation?

 

Is it a spiral pancake coil? Can you find a picture? I find it hard to see in your words.

 

With no magnetic metals to provide a better path than air, the field will be quite extended.
The exact same moment any power is taken out of this generator it will create an opposing field due to current flow. This opposing field will limit your magnets field to the area around the first few turns of wire.

Understand?