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There are 45 number of cells with internal resistance of each cell is 0.5Ω.  To get the maximum current through a resistance of 2.5Ω,  one can use m rows of cells, each row having n cells. The values of m and n are 

a
m=3,  n=15
b
m=5,  n=9
c
m=9,  n=5
d
m=15,  n=3

detailed solution

Correct option is A

For maximum current  mR=nr and  mn=45Solving, n = 15 and m = 3.

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