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Question

In a mixed grouping of identical cells 5 rows are connected in parallel and each row contains 10 cells. This combination send a current i through an external resistance of 20Ω. If the emf and internal resistance of each cell is 1.5 volt and 1Ω respectively then the value of i is

A
0.14 A
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B
0.25 A
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C
0.75 A
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D
0.68 A
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Solution

The correct option is D 0.68 A
No. of cells in a row n = 10; No. of such rows m = 5
i=nE(R+nrm)=10×1.5(20+10×15)=1522=0.68 amp

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