In a potentiometer experiment the balancing with a cell is at length $240\, cm$. On shunting the cell with a resistance of $2$ $\Omega$, the balancing length becomes $120\, cm$. The internal resistance of the cell is ................. $\Omega $
AIEEE 2005, Medium
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(b) $r = R\,\left( {\frac{{{l_1}}}{{{l_2}}} - 1} \right)$$ = 2\,\left( {\frac{{240}}{{120}} - 1} \right)$ $ = 2\,\Omega $
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