For the circuit shown in the following figure, (A) The current \( I \) through the battery is \(...

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For the circuit shown in the following figure,
(A) The current \( I \) through the battery is \( 7.5 \mathrm{~mA} \)
(B) The potential difference across \( R_{3} \) is \( 18 \mathrm{~V} \)
(C) Ratio of powers dissipated in \( R_{1} \) and \( R \), is 3
(D) If \( R_{1} \) and \( R_{2} \) are interchanged, magnitude of the power dissipated in \( R \), will decrease by a factor of 9
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