\( \mathbf{n} \) identical cells whether joined together in series or in parallel, give the same...

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\( \mathbf{n} \) identical cells whether joined together in series or in parallel, give the same current, when
\( \mathrm{P} \) connected to an external resistance \( \mathrm{R} \) . The internal

W resistance of each cell is :-
(1) \( \mathrm{r}=\mathrm{nR} \)
(2) \( \mathrm{r}=\mathrm{R} \)
(3) \( r=\frac{R}{n} \)
(4) \( r=n^{2} R \)
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