A cell having emf E and internal resistance r is connected across a variable resistance R. As the resistance R is increased the plot of the potential difference V across  R is given by

# A cell having emf E and internal resistance r is connected across a variable resistance R. As the resistance R is increased the plot of the potential difference V across  R is given by

1. A
2. B
3. C
4. D

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Potential difference across R, $\mathrm{V}=\mathrm{IR}=\frac{\mathrm{ER}}{\mathrm{R}+\mathrm{r}}=\frac{\mathrm{E}}{1+\frac{\mathrm{r}}{\mathrm{R}}}$