In the circuit shown in figure- 3.389 , the voltmeter reads \( 30 \...

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In the circuit shown in figure- 3.389 , the voltmeter reads \( 30 \mathrm{~V} \) when it is connected across \( 400 \Omega \) resistance. Calculate
\( \mathrm{P} \) what the same voltmeter will read when it is connected across the \( 300 \Omega \) resistance.
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Figure 3.389
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