Statement - (A) : Series combination of cells is preferred when external resistance is large compared to internal resistance of cell.
Statement - (B) : Parallel combination of cells is preferred when external resistance is small compared to the internal resistance of each cell

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A and B are true

A is false, B is true

A and B are false

A is true, B is false

answer is A.

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Detailed Solution

In a series combination,

Current $i = \frac{nE}{nr + R}$

In a parallel combination,

Current $i = \frac{E}{\frac{r}{n} + R} = \frac{nE}{r + nR}$

When external resistance is large compared to internal resistance of cell, higher power is delivered in series due to higher current and vice versa. So, both statements are true.

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