Question

A galvanic cell has electrical potential of $1.1V$. If an opposing potential of $1.1V$ is applied to this cell, what will happen to the cell reaction and current flowing through the cell?

Answer 1

The electrode potential of galvanic cell $E_{cell}=1.1V$
The opposing potential $E_{ext}=1.1V$
Thus, $E_{cell}=E_{ext}$

When opposing potential becomes equal to cell potential:
(i) No current flows through the cell.
(ii) The reaction stops completely.

Hence, the cell reaction stops when opposing potential of $1.1V$ is applied to the cell.