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Now back to charges which are distributed on the outer surfacesnip
of a metallic sphere. What keeps them at rest? Unless we say
that Fnet=m*a does not apply to electrons on the sphere (a=0
means Fnet=0) we MUST invent a force. Some say this can only
be done by using QM. And then they say that the concept of F
does not belong to the arsenal of its tools. Even if the concept
of F ("Pauli F") was acceptable, the QM can not be used to explain
things before students learn it.
Something is not right somewhere. There must be an attractive
force acting on each bunch of electrons; it must be equal and
opposite to the repulsive force exerted on it by other bunches.