For a cell, the graph between the potential difference $(V) $ across the terminals of the cell and the current $(I)$ drawn from the cell is shown in the figure. The $e.m.f.$ and the internal resistance of the cell are
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E.m.f. is the value of voltage, when no current is drawn from the circuit so $E = 2\,V$.
Also $r = $ slope $=\frac{2}{5} = 0.4\,\Omega $
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