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If n identical cells, each of emf E and internal resistance r are connected in series, the emf of combination is nE and the internal resistance of the combination is nr

If n identical cells, each of emf E and internal resistance r are connected in parallel, the emf of the combination is E/n and the internal resistance of the combination is r/n

Cells should be connected in series, if the external resistance R is very large compared to internal resistance r

Cells should be connected in parallel if R is very small compared to r

answer is A, C, D.

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Detailed Solution

If n identical cells, each of emf E and internal resistance r are connected in parallel, the emf of the combination is E and the internal resistance of the combination is r/n
In series, $I_{s} = \frac{n E}{n r + R}$ .
If $R > > r$ , then $I_{s} = \frac{n E}{R}$ .
If $R < < r$ , then $I_{s} = \frac{E}{r}$ (constant)
In parallel, $I_{p} = \frac{E}{\frac{r}{n} + R}$ .
If $R > > r$ , then $I_{p} = \frac{E}{R}$ (constant).
If $R < < r$ , then $I_{p} = \frac{n E}{r}$