  Spatial geometry of charged thin rotating and non-rotating rings in a
rotating frame is investigated. It is shown, on an example of interaction
between a charged probe and two positive charged non-rotating and negative
charged rotating rings that the spatial geometry of the rotating ring in the
rotating frame has to be different to the spatial geometry of the rotating
frame. In the absent of direct relation between the spatial geometry rotating
frame and the spatial geometry of the rotating ring in that frame the
possibility of a non-flat spatial geometry of rotating electron rings in
tokamak plasma is discussed.
