A battery of e.m.f. 10 V and internal re...

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

`0.5 Omega`

`1.0 Omega`

`2.0 Omega`

`0.25 Omega`

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