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(B) According to the maximum power transfer theorem,the power delivered to the external circuit is maximum when the external resistance $(R_{ext})$ is

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$R=3 R_0$

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(B) According to the maximum power transfer theorem,the power delivered to the external circuit is maximum when the external resistance $(R_{ext})$ is equal to the internal resistance $(R_0)$ of the source.In the given circuit,all three resistors of resistance $R$ are connected in parallel across the terminals of the $DC$ source.Therefore,the equivalent external resistance is $R_{ext} = \frac{R}{3}$.For maximum power,we set $R_{ext} = R_0$.$\Rightarrow \frac{R}{3} = R_0$$\Rightarrow R = 3 R_0$.

$A$ $DC$ source with internal resistance $R_0$ is connected to three identical resistors each of resistance $R$ as shown in the figure. If the thermal power generated in the circuit is highest,then

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