the theory magnetic field is produced by moving electric charges the field is proportional to the quantity and velocity of those charges the velocity of electrons is about 1mm/s at 15A/mm~2 in copper the velocity of a cd spinning is about 1000RPM 6m/s 6000 times more the the speed of the electrons so if the electrons where to flow around a cd that is spinning at 6m/s the electrons should move at 6.001m/s and the field 6000 times stronger the setup a cd with copper wire wound around it (20windings) with two contacts (see picture) that are connected to a pc power supply at 12V results in about 2A. the screwdriver has a magnetic tip and rotates about 45deg when current is flowing throw the copper coil wile not spinning. the result the screwdriver moves exactly the same amount??!!! anyone has an idea? electron velocity not in the mm/s range?