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Take a circular ring with a net positive charge uniformly spread around
the ring. Let the ring be rotating about an axis through the center of the
ring and perpendicular to the plane of the ring. Call this the x-axis. Now
add a time-independent magnetic field that has a radially outward
component at each element of the ring (as well as perhaps a component
parallel to the x-axis). By radial I mean perpendicular to the x-axis.
Such a field could be produced, for example, by a bar magnet placed along the
x-axis at some distance from the center of the ring with the north pole
closer to ring. However, to make the model simple, I imagine that the
radial component of the magnetic field is independent of x.