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Question

100 cells each of emf 5V and internal resistance 1Ω are to be arranged so as to produce maximum current in a 25Ω resistance. Each row contains equal number of cells. The number of rows should be

A
2
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B
4
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C
5
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D
10
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Solution

The correct option is A 2
Total no. of cells, = mn = 100 ......(i)
Current will be maximum when R=nrm;25=n×1mn=25 m .......(ii)
From equation (i) and (ii) n = 50 and m = 2

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