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

R = r

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R = \frac{r}{2}

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R =2r

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R= 0

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Solution

The correct option is D $R = \frac{r}{2}$
Power delivered will be maximum only when external resistance = Internal resistance.
Total internal resistance = $\frac{r}{2}$
$∴$ External resistance, is $R = \frac{r}{2}$

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

The correct option is D R=r2Power delivered will be maximum only when external resistance = Internal resistance.Total internal resistance = r2∴ External resistance, is R=r2

The correct option is D $R = \frac{r}{2}$
Power delivered will be maximum only when external resistance = Internal resistance.
Total internal resistance = $\frac{r}{2}$
$∴$ External resistance, is $R = \frac{r}{2}$