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(C) The terminal potential difference $V$ of a cell is given by the relation $V = E \pm Ir$,where $E$ is the $e.m.f.$,$I$ is the current,and $r$ is th

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Being charged

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(C) The terminal potential difference $V$ of a cell is given by the relation $V = E \pm Ir$,where $E$ is the $e.m.f.$,$I$ is the current,and $r$ is the internal resistance of the cell.When a cell is being discharged,$V = E - Ir$,so $V When a cell is in an open circuit,$I = 0$,so $V = E$.When a cell is being charged,the current flows into the positive terminal,so the relation becomes $V = E + Ir$. Therefore,$V > E$.Thus,the terminal potential difference is greater than the $e.m.f.$ only when the cell is being charged.

The terminal potential difference of a cell is greater than its $e.m.f.$ when it is

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