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A battery of emf 10 V and internal resis...

A battery of emf `10 V` and internal resistance `0.5 Omega` is connected across a variable resistance `R`. The value of `R` for which the power delivered in it is maximum, is given by

A

`0.5Omega`

B

`1Omega`

C

`1.5Omega`

D

`2Omega` resistance in parallel with the parallel combination of `3Omega` and `6Omega`.

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