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BTW I also think that saying the capacitor "stores charge " is reasonable;
for two reasons.
(1) the silly trivial reason, it is storing a paritcular configuration of
charge; for example a neutral spherical conductor is storing charge.
Admittedly as much negative as positive charge.
(2) What is a misconception with the following statement, regarding ordinary
two conductor capacitors (ordinary, meaning what we see in intro physics,
e.g. the parallel plate capacitor)
" A capacitor is a device, that stores charge; the charge stored by the
capacitor is defined to be the net charge on the conductor that has a net
positive charge on it."
There is verbage that follows this, i.e. the verbage of examples and how
charge the thing up with an emf, etc etc. It is important verbage as it is
the discussion and explanation of the words mean and is analogous to all the
verbage that follows the definition of velocity and acceleration that one
uses to explain what those words mean.
Perhaps there are a better set of words to describe the situation, but the
words along with their definitions do not constitute a misstatement of the
facts and are therefore not a misconception of the same type as is "the
higher temperatures in a green house are due to the 'Green House effect' ".