Two cells of equal e.m.f. E b ut of diff...

Two cells of equal e.m.f. E b ut of difference internal resistance `r_(1)` and `r_(2)` are connected in parallel and the combination is connected with an external resistance R to obtain maximum power in R. find the value of R

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The correct Answer is:

`(r_(1)r_(2))/(r_(1)+r_(2))`

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