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Thus, in the two-capacitor case, an ideal switch when closed
(zero resistance) implies an equal potential difference on each side,
so one is trying suddenly to impose the condition of equal p.d. across
two capacitors which, by the initial supposition, are at a different
p.d. The interface is therefore undefined (what p.d. is it at?), and
the outcome is indeterminate (which side changes, by how much,
and in what way?).