now:
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if you drop a magnet down a copper pipe it seems to experience a resistance force acting against it despite the copper being non-magnetic this is caused by the magnets generating electrical current in the copper called Eddy currents and these Eddy currents create a magnetic field within the copper as oppose the permanent magnet almost like an invisible no contact frictional force acting between the magnet and the copper now my plan is to use a metal disc and a disc full of magnets mounted very close to one another to potentially create some kind of magnetic clutch to replace the gear system on a bicycle I started by cutting two discs on my CNC router one for aluminum and one from copper the reason for this is I'm not sure which is the best material for this application my intuition would say copper as it's far more conductive than aluminum but if you ask Google it claims aluminum is the best and has a research paper to back it up however the majority of any cur