A) Series
B) Parallel
C) Mixed
D) Depends upon the relative values of external and internal resistance
Correct Answer: D
Solution :
Current taken from the combination of n cells each of internal resistance r in series with external resistance R is \[i=\frac{nE}{nr+R}\] Similarly, for parallel combination \[i=\frac{nE}{r+nR}\] For mixed grouping of n such cells in m rows with external resistance R is \[i=\frac{mnE}{mR+nr}\] It is obvious that maximum current obtained from each combination depends on relative values of external and internal resistance.
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