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The classical radius of the electron is e^2/(4 pi epsilon-0 m c^2)
which is 2.8 x 10^(-15) m. It is a bit artificial, since it is the
radius
the electron would have to be if it were uniformly charged and
its rest mass was given by its electrostatic energy divided by c^2.
No experiment has detected any internal charge or mass
distribution for either the electron or for any quark, ....