# NEET Physics Current Electricity Questions Solved

Two cells of equal e.m.f. and of internal resistances r1 and ${r}_{2}\left({r}_{1}>{r}_{2}\right)$ are connected in series. On connecting this combination to an external resistance R, it is observed that the potential difference across the first cell becomes zero. The value of R will be

(1) ${r}_{1}+{r}_{2}$

(2) ${r}_{1}-{r}_{2}$

(3) $\frac{{r}_{1}+{r}_{2}}{2}$

(4) $\frac{{r}_{1}-{r}_{2}}{2}$

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