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A variable, opposite external potential ...

A variable, opposite external potential `(E_(ext))` is applied to the cell
`Zn| zn^(2+)(1M) || Cu^(2+)(1M)| Cu`, of potential 1.1 V.
When `E_(ext) lt 1.1V` and `E_(ext) gt 1.1 V`, respectively electrons flow from:

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