We know, Ecell= Ecathode – Eanode
For reaction to be spontaneous, Ecellshould have a positive value and ΔrGcellnegative.
At equilibrium, Ecell = 0, as current stops flowing.
Or, Ecathode = Eanode
Hence, Current stops flowing when ECell = 0 because equilibrium of the cell reaction is attained.
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