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In a potentiometer experiment the balancing with a cell is at length $240 \mathrm{~cm}$. On shunting the cell with a resistance of $2 \Omega$ the balancing length becomes $120 \mathrm{~cm}$. The internal resistance of the cell is
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$2 \Omega$
$2 \Omega$
$\mathrm{r}=\mathrm{R}\left[\frac{\ell_1}{\ell_2}-1\right]=2\left[\frac{240}{120}-1\right]=2 \Omega$
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