The maximum power developed across a variable resistance \( R \) in the circuit shown in figure ...

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The maximum power developed across a variable resistance \( R \) in the circuit shown in figure is
(1) \( 50 \mathrm{~W} \)
(2) \( 75 \mathrm{~W} \)
(3) \( 25 \mathrm{~W} \)
(4) \( 100 \mathrm{~W} \)
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