Good point, it would make it unidirectional, if not necessarily self-starting (dynamic friction is lower than static friction). So any magnetic field at play must be self generated.
I wonder, would a ball put across two horizontal, static and concentric circular rails rotate by circulating current through it via the rails? If it did, this would invalidate your theory wouldn't it? Michel 2009/8/24 Stephen A. Lawrence <[email protected]>: > > > Michel Jullian wrote: >> There may be another cause for a net B field through the ring: the >> Earth's. (apologies if this was mentioned before, haven't followed the >> discussion closely) > > Too weak to be significant, almost certainly, but more to the point a > fixed field through the ring would make the motor unidirectional and > self-starting. It's neither. > >
