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Schwinger showed that for a charged elementary fermion, the g-factor obeys g/2 = 1 + alpha / 2*pi + O(alpha^2) .

Given that g/2 is the ratio between the "charge rotation" and the "mass rotation", the expression should imply that charge rotates faster than mass (assuming that both have the same spatial distribution). Is this correct? Or is it the other way round?

Schwinger calculated the anomalous magnetic moment of electron, not of any fermion. Proton and neutron have quite significant anomalous magnetic moments, which are calculable.

A macroscopic solid body, bearing some charge, may have any ratio of the angular momentum to magnetic moment, but it does not mean that the charged parts move differently than uncharged ones. Vote to close.

I added "elementary" to the question, which I had implied but forgotten to state explicitly.

This is not graduate-level, voting to close.

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