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In an experiment on measurements of emf of a cell by a potentiometer, the balancing length for a cell of emf$\mathrm{E}$and internal resistance$\mathrm{r}$is found to be$l$. Now if another cell of emf$\mathrm{E}$and internal resistance$2\mathrm{r}$is connected in parallel to the first cell and balancing length determined, then the balancing length will be-