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Students might be misled by the following (quoted) paragraph
into believing that Coulomb's law works regardless of the shapes
of the charged objects. Something needs to be said about point
(small) charges versus extended charges; you might also want
to point out, just briefly, that spherical charged objects, under
the right circumstances, work almost as well as point charges.
Coulomb's law does not work very well with charges arranged
on closely-spaced pairs of flat conducting plates, for example.
Speaking of conductors, I see you've omitted any discussion of
them (versus insulators). This may or may not be intentional on
your part. ...