There's an old textbook effect whereby if you have a hollow electrically-charged sphere (where there's initially no detectable internal field because of cancellation), if you then spin the sphere, it generates an internal field whose strength increases with distance from the rotation axis.
The effect has a specific name - I once found it in a textbook - but I can't remember what it's called, and haven't been able to find it again since. Does anyone know its official name?
Qualitatively, a rotating hollow charged sphere must produce a quasi-uniform magnetic field pointed along the rotation axis. The magnetic field exerts force on moving charge carriers and results in redistribution of the charge on the sphere. In case of the counterclockwise rotator, the polar regions will contain an excess of electrons whereas the equatorial region will have a deficit of them. Something similar is observed in the magnetosphere of pulsars (neutron stats).
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