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But we can also remove, say, negative charge from each plate, such that
both plates end up with positive net charge. If we remove different
magnitudes of negative charge from the two plates, both plates have net
positive charge, but there is a potential difference between the plates.
One plate would be at higher potential than the other even though both
are positive. I would designate the higher-potential plate with a plus
and the lower-potential plate with a minus where these signs are used to
indicate which plate is at higher/lower potential.
Now... If deltaV = q/C, which plate has charge q? I would say neither.
I would say q in the capacitor equation represents half the difference
in the net charges on the plates. I would say deltaV = q/C with q = (Q+
minus Q-)/2.
Am I missing something here?