Do purely electrostatic ion traps exist?

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I was wondering whether you could trap a cation simply by putting it inside a positively charged sphere. Is this possible?
 
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This is impossible, see Earnshaw's theorem. You can also use Gauß' law to get the same result for a single charge in an electric field.
 
Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
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