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Question

Two identical batteries,each of emf 2 V and internal resistance r=1 Ω by passing a current through it. The maximum power that can be developed across R=1 Ω using these batteries is

A
169 W
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B
259 W
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C
2 W
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D
4 W
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Solution

The correct option is A 169 W
When m identical cells are connected in parallel,
I=ϵiR+rim
As two batteries are connected in parallel. ϵ1=ϵ2=2 V,r1=r2=1.0 Ω,R=1 Ω
I=21+12=43 A
Power developed resistance=I2R=169 W

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