Thank you very much Peter,

I did not know about that drag caused by a rotating magnet. I was thinking if the magnetism is what that is causing this effect (the current) along with the centrifugal force, I was thinking of pressing two SAME poles of two magnets together to create a so called sharp north between them, while laying the copper disc between them too. In theory it seems that the current produced must be much more, but I am not sure anyway.

If I had access to good brushes or commutators I would have conducted this experiment to see what happens.

Thanks again,