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Two cells , each of emf E and internal r...

Two cells , each of `emf E` and internal resistance `r`, are connected in parallel across a resistor `R`. The power delivered to the resistor is maximum if `R` is equal to

A

`R=r`

B

`R=2r`

C

`R=(3r)/(2)`

D

`R=(r)/(2)`

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